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First, a brief description based on statements:
1, Description: Create Database
CREATE DATABASE database-name
2, Description: delete the database
drop database dbname
3, Description: Backup sql server
--- create a backup of the data device
USE master
EXEC sp_addumpdevice 'disk', 'testBack', 'c: \ mssql7backup \ MyNwind_1.dat'
--- start backup
BACKUP DATABASE pubs TO testBack
4, Description: Create a new table
create table tabname (col1 type1 [not null] [primary key], col2 type2 [not null ],..)
According to already Some of the table to create a new table:
A: create table tab_new like tab_old (using the old tables to create a new table)
B: create table tab_new as select col1, col2 ... from tab_old definition only
5, note: delete the new table
drop table tabname
6, Description: Add a column
Alter table tabname add column col type
Note: the column will not be removed to increase. After the DB2 data types in the list with no change, the only change is to increase the length of varchar type.
7, Description: Add a primary key: Alter table tabname add primary key (col)
Description: Remove the primary key: Alter table tabname drop primary key (col)
8, Description: Create an index: create [unique] index idxname on tabname (col ....)
remove the index: drop index idxname
Note: The index is not changed, want to change to remove the re-construction.
9, Description: create a view: create view viewname as select statement
deleted view: drop view viewname
10, Description: a few simple basic sql statement
select: select * from table1 where range
insert: insert into table1 (field1, field2) values (value1, value2)
delete: delete from table1 where range
updates: update table1 set field1 = value1 where the scope of
Find: select * from table1 where field1 like '% value1%' --- like the syntax is very subtle, information search!
Sort: select * from table1 order by field1, field2 [desc]
Total: select count * as totalcount from table1
sum: select sum (field1) as sumvalue from table1
Average: select avg (field1) as avgvalue from table1
maximum: select max (field1) as maxvalue from table1
Minimum: select min (field1) as minvalue from table1
11, Description: several high-level query operations term
A: UNION operator
UNION operator results through a combination of the two other tables (for example, TABLE1 and TABLE2 ) and to eliminate any duplicate rows in the table derives a result table. When the UNION ALL when used in conjunction with (or UNION ALL), not eliminate duplicate rows. In both cases, derived not from each row of the table is from TABLE1 TABLE2.
B: EXCEPT Operator
EXCEPT operator by including all but not in TABLE2 TABLE1 in the line and remove all duplicate lines and derive a result table. ALL EXCEPT when used in conjunction with the time (EXCEPT ALL), not eliminate duplicate rows.
C: INTERSECT operator
INTERSECT operator by only TABLE1 and TABLE2 in both the line and remove all duplicate lines and derive a result table. When ALL INTERSECT when used in conjunction with (INTERSECT ALL), not eliminate duplicate rows.
Note: Use the operation of several query results word line must be the same.
12, Description: Use outer join
A, left outer join:
left outer join (left join): The result set includes the connection table matches several rows, but also left all the lines connecting the table.
SQL: select aa, ab, ac, bc, (...) , bd, bf from a LEFT OUT JOIN b ON aa = bc
B: right outer join:
the right outer join (right link): result set not only including the connection line to connect the matching table, the table also includes the right to connect all the lines.
C: full outer join:
all external connections: not only match the symbolic link table rows, also includes two connections in the table all the records.
Secondly, we see some good sql statement
1, (...) , Description: Copy table (only copy the structure, the source table name: a New Table Name: b) (Access available)
Act 1 : select * into b from a where 1 1
Method 2: select top 0 * into b from a
2, Description: Copy table (copy the data source table name: a target table Name: b) (Access available)
insert into b (a, b, c) select d, e, f from b;
3, Description: cross-database copy between the tables (specific data using the absolute path) (Access available)
insert into b (a, b, c) select d, e, (...) , f from b in 'specific database' where conditions
example: .. from b in '\Server.MapPath (\select a, b, c from a where a IN (select d from b) or: select a, b, c from a where a IN (1,2,3)
5, Note: Display the article, The author and the final response time
select a.title, (...) , a.username, b.adddate from table a, (select max (adddate) adddate from table where table.title = a.title) b
6 Description: outer join query (table name 1: a table name 2: b)
select aa, ab, ac, bc, bd, bf from a LEFT OUT JOIN b ON aa = bc
7, Description: Online view query (table name 1: a)
select * from (SELECT a, b, c FROM a) T where ta> 1;
8, note: between the use of , (...) , between the data limits the scope of inquiry, including the boundary values, not between not including
select * from table1 where time between time1 and time2
select a, b, c, from table1 where a not between Value 1 and Value 2
9, note: in the use
select * from table1 where a [not] in ('value 1', 'value 2', 'value of 4', 'value of 6')
10, Description: two related tables, delete the main table, the table does not have the information, Deputy
delete from table1 where not exists (select * from table2 where table1.field1 = table2.field1)
11, Description: 4 tables together into the problem:
select * from a left inner join b on aa = bb right inner join c on aa = cc inner join d on aa = dd where .....
12, Note: the schedule for five minutes in advance to remind
SQL: select * from schedule where datediff ('minute', f the start time, getdate ())> 5
13, Description: A database sql statement buttoned page
select top 10 b. * from (select top 20 primary key fields, sort fields from table name order by sort field desc) a, table name b where b. primary key field = a. primary key field order by a. sort field
14, Description: the first 10 records
select top 10 * form table1 where range
15, note : Select the value in each group b the same data in a corresponding record of the greatest of all information (like this forum for a monthly usage can be used to list, selling products of every month, according to subject performance ranking, and so on. )
select a, b, c from tablename ta where a = (select max (a) from tablename tb where tb.b = ta.b)
16, Note: includes all in but in the TableA not TableB and TableC the line and remove all duplicate lines and derive a result table
(select a from tableA) except (select a from tableB) except (select a from tableC)
17, (...) , note : Remove the 10 random data
select top 10 * from tablename order by newid ()
18, Description: The randomly selected records
select newid ()
19, Description: Remove duplicate records
Delete from tablename where id not in (select max (id) from tablename group by col1, (...) , col2 ,...)
20, Description: list of all database table name
select name from sysobjects where type = 'U'
21, Description: The table lists all the
select name from syscolumns where id = object_id ('TableName')
22 Description: shows the type, vender, pcs field to field type arrangement, case can easily achieve multiple choice, similar to the select in the case.
select type, sum (case vender when 'A' then pcs else 0 end), sum (case vender when 'C' then pcs else 0 end), sum (case vender when 'B' then pcs else 0 end) FROM tablename group by type
displayed:
type vender pcs
computer A 1
Computer A 1
CD B 2
CD A 2
phone B 3
Mobile C 3
24, Description: Choose from 10 to 15 records
select top 5 * from ( select top 15 * from table order by id asc) table_ aliases order by id desc
random selection method of database records (using the Randomize function, (...) , achieved through the SQL statement)
on the data stored in the database , the random number feature can give the above effect, but they may slow a bit. You can not ask ASP \In fact common solution is to build the cycle as follows:
Randomize
RNumber = Int (Rnd * 499) +1
While Not objRec.EOF
If objRec (\\First, you remove the 1 to 500 within the scope of a random number (assuming 500 is the total number of database records). Then you loop through each record to test the value of ID to check whether it matches RNumber. Meet the conditions, if the implementation of the THEN keyword for the beginning a code. If your RNumber equal to 495, then loop again to the database may take a long time. Although this number seems too big 500, but more stable than an enterprise solution that is a small database, (...) , and the latter is usually within a database that contains thousands of records. This time not on the dead?
using SQL, (...) , you can quickly find accurate records and open only to contain the record of a recordset, as follows:
Randomize
RNumber = Int (Rnd * 499) + 1
SQL = \\As long as you are satisfied with the work of the above code, you can demand action from the \Recordset does not contain other elements, so you can quickly find the records you need so greatly reduce the processing time.
talk about random number
Now you drained Random function is determined to the last drop of oil, then you may take out more than a random record or want to use the records within a certain random. Random example of the above criteria can be expanded about the two cases above, the SQL response.
to take out a few random selection of records and stored within the same recordset, you can store three random numbers, and then query the database match these figures were record:
SQL = \& RNumber & \list), you can use BETWEEN or mathematical equation selected the first record and the appropriate number of incremental records. This operation can be accomplished in several ways, but the SELECT statement shows only a possible (where ID is an automatically generated number):
SQL = \AND \
random reads some records, tested
Access syntax: SELECT top 10 * From the table name ORDER BY Rnd (id)
Sql server syntax: select top n * from table name order by newid ()
MySql Syntax: Select * From Table Name Order By rand () Limit n
Access left connection syntax (use the left to connect the recent development, Access to help nothing, the Internet is not the SQL Access Note that only their own tests, and now record for later inspection)
syntax: Select table1.fd1, table1, fd2, table2.fd2 From table1 left join table2 on table1.fd1, table2.fd1 where ...
use SQL statements instead of long strings with ... show
syntax:
SQL database: select case when len (field)> 10 then left (field, 10 )+'...' else field end as news_name, news_id from tablename
Access database: SELECT iif (len (field)> 2, left (field, 2 )+'...', field) FROM tablename;
Conn . Execute instructions
Execute method
the method used to execute SQL statements. SQL statement is executed according to whether to return record set, use the format of the method is divided into the following two:
1. Implementation of the SQL query, the query will return the resulting recordset. Usage is:
Set the object variable name = connection object. Execute (\method, the Recordset object is assigned to the specified save, after an object variable represents the Recordset object.
2. The operational implementation of SQL language, no records set to return. Use this time to:
connection object. Execute \the number of records are automatically saved to the variable. By accessing the variable, you can know how many SQL statements team records the operation.
? Option Option, the parameter value usually adCMDText, it used to tell ADO, should be after the Execute method of the first character interpreted as a command text. By specifying the parameters could make the implementation more efficient.
? BeginTrans, RollbackTrans, CommitTrans method
these three methods is the connection object to provide methods for transaction processing. BeginTrans for the start of a thing; RollbackTrans used to roll back the transaction; CommitTrans submit all the transactions for the results, that confirm transactions.
transaction can be a set of operations as a whole, all statements are successful only after the execution of the transaction be successful; If one has a statement fails, then the whole deal even if the failure to restore everywhere in the state before .
BeginTrans and CommitTrans used to mark the begin and end, between these two statements, that is, as the transaction statements. To judge the success of the transaction can be set by connecting Error object to achieve, if a member of the collection Error number is not 0, it indicates an error occurs, the transaction failed. Error Error for each collection object, representing an error message.
Whether you have a boyfriend, has a girlfriend, have come to read it and write is really such a thing
you find it?
feeling of love, (...) , always very sweet in the beginning,
always feel much more of a stay by one more person to help you share,
you finally no longer alone, at least one person thinking of you,
Lianzhao you, whether to do anything,
long as we can, together, that is good ....
...
.... but slowly, with the deeper understanding of each other,
you begin to discover each other's shortcomings,
The problem occurred one after another ,
you start trouble, tired, or even want to avoid,
Some say love is like picking up rocks,
always want to pick up one for his own,
but how do you know when to picked it?
him / her for you, then you fit him / her do?
In fact, the same love as terrazzo,
may just pick up, you is not so satisfied,
But remember that people are flexible,
many things can be changed,
as long as you determination, courage,
pick around with the unknown stone,
not as good as his Haohao De already have the stone Sharpen, you start to wear it?
Many people think that because the feeling faded,
so talent will become lazy.
wrong!
is conquered people first to be inert,
it will lighten the feeling.
at a dinner occasion,
was suggested that a body good to eat more shrimp,
this time there is a middle-aged man suddenly said, (...) , \My wife was my girlfriend, she said to eat 10 shrimp, I peel 20 to her!
Now, if she wanted me to help her peel shrimp, kidding! I could not even help her to undress no interest, and also shell shrimp in a blanket! \Understand?
No wonder more and more people just want to talk about a lifetime of love,
has refused to marriage.
because marriage is easy to become lazy people.
If everyone
too lazy speech,
too lazy to listen,
too lazy to create surprise,
too lazy tenderness,
then the husband and wife or lovers,
how can not drift away gradually silent then?
* So remember:
dynamic love,
need proper irrigation hospitality,
love, it is not lazy, oh!
a couple, similar to dinner after work, shopping,
but girls because the company delayed the meeting,
when she arrived at a time when Mao Zhaoyu has been late more than 30 minutes,
his boyfriend was very unhappy to say:
you every time so I have not had any mood,
I will not do so on you!
of a sudden, the girl finally burst their banks collapsed,
she thought to myself: Maybe they never had
the same future in the same place, another couple is facing the same situation;
too late when the girls arrived half an hour, (...) ,
his boyfriend, said: \rain off his coat and cap to girls,
at the moment, the girl in tears
but flow through her tears on my face is warm.
you feel it?
fact, love, hate often just one of our idea!
love not only to know how to be more tolerant to time,
is a lot of things may just change your mind too!
understand?
when individuals fall in love with you, and you feel good to him.
that does not mean you would choose him.
We always said: \but you can not answer him, because you do not know.
Yes, we always thought we would find a people who themselves love love.
but later, when we suddenly look back, we will have found themselves how naive.
if never started, you know how that person will love love it?
fact, love the feeling of love is to experience the many things together until after the discovery.
Perhaps everyone wants to be able to find their partner in mind 100 percent,
『but you have not thought about early in your side would have been silent for a long time for you to pay, but you do not find it? 』
It, or look at the people around it! He may have been waiting for you for a long time
When you love someone, love to just eight absolute good.
all the expectations and hopes are only Qiba Fen; the remaining two or three minutes to love myself.
If you continue to love more, give the other party is likely to pressure for each breath,
completely lost the love of fun.
So remember,
drink no more than six drunk,
eat no more than seven full,
love a person no more than eight
If you is also for love lost, perhaps the following passage can give you some inspiration:
love a person, to understand, but also open solution;
to apologize, but also thanks;
to admit his fault, but also error correction;
be considerate, but also understanding;
is to accept, not tolerate;
is tolerance, not condoned;
is to support, not dominate;
is sympathy, not asked;
is talk, not complaints;
is memorable, but not forgotten;
is mutual exchanges, instead of having accountability;
is quietly praying for each other,
rather than the many other demands;
can be romantic, but do not waste;
Minnesota Vikings QB Brett Favre was beat a lot by the Saints in the NFC title game last season. JAY CUTLER jersey , JOE THOMAS jersey, It is said that some of the hits were illegal and should have been penalized. But Favre did not think so, so does Drew Brees.
"I understand a quarterback's going to get hit, people are going to get hit. KERRY COLLINS jersey, larry FITZGERALD jersey, It's football," Vikings coach Brad Childress said Sunday. "I don't have any illusions about that. What I hate to see are late hits or attempts to hurt anybody. I don't think there's a place for that in the game."
Brett Favre, however, downplays the punishment. Limas Sweed jersey, MATT CASSEL jersey, He said Sunday he felt worse after a victory in Week 3 last year over the 49ers than he did after the loss to the Saints.
Brett Favre just said it is football. MATT RYAN jersey, Nnamdi Asomugha jersey, When you have the chance to hit, you should hit, and hit hard. Saints QB Drew Brees concurred.
Brees said, "I would say that any defensive player, Pat White jersey, Patrick Willis jersey, when they have a chance to take a shot at the quarterback legally, you're going to take it."
Childress is staunchly defending his decision to keep Tarvaris Jackson as QB Brett Favre's backup instead of Sage Rosenfels, Percy Harvin Jersey, PEYTON MANNING jersey, who was since traded to the Giants. Childress also says WR Percy Harvin will be the team's kick returner when they open at New Orleans on Thursday night.
In Thursday’s season opener, R. Lewis jersey, Randy Moss Jersey, the New Orleans Saints say they'll be just as aggressive. RONDE BARBER jersey, Steve Slaton Jersey, The Minnesota Vikings and Brett Favre are sure to have expected that and get well prepared for that.
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Our http://www.tiffanyinthebox.com/ enable everyone to afford Tiffany silver jewelry. Here you can find the most competitive price for your dreamed Tiffany necklace, Tiffany bracelet and Tiffany key pendant.For all Tiffany wholesale, (...) , you can enjoy discount -85%-90% OFF! That means you can get the best tiffany jewelry at wholesale price.
I got this Tiffany handbag charm necklace yesterday. The (...) is made of sterling silver. The pendant is a handbag on which there is a blue enamel heart. Everything just seems so natural and harmonious.
I can’t help wearing this Tiffany necklace to work today. My colleagues like my necklace, too. They asked me how much the Tiffany necklace is and where to buy it. When I told them that my necklace only cost $40, they couldn’t believe that. I bought this (...) from an online Tiffany jewelry supplier, tiffanyhere.com. The supplier offers Tiffany wholesale including Tiffany necklace, http://www.fmheroes.com/ , Tiffany bracelet, (...) , (...) , Tiffany key pendant, etc. Every piece of (...) is cheaper that sold in the market. The Tiffany silver jewelry sold there has high quality and unique designs. The most important thing is that I can afford more pieces of Tiffany silver jewelry.
Tiffany always does well in adding unique and new points to their (...) . If you like Tiffany jewelry as me, you can buy Tiffany jewelry from online stores, beautiful and saving much.
1, Description: Create Database
CREATE DATABASE database-name
2, Description: delete the database
drop database dbname
3, Description: Backup sql server
--- create a backup of the data device
USE master
EXEC sp_addumpdevice 'disk', 'testBack', 'c: \ mssql7backup \ MyNwind_1.dat'
--- start backup
BACKUP DATABASE pubs TO testBack
4, Description: Create a new table
create table tabname (col1 type1 [not null] [primary key], col2 type2 [not null ],..)
According to already Some of the table to create a new table:
A: create table tab_new like tab_old (using the old tables to create a new table)
B: create table tab_new as select col1, col2 ... from tab_old definition only
5, note: delete the new table
drop table tabname
6, Description: Add a column
Alter table tabname add column col type
Note: the column will not be removed to increase. After the DB2 data types in the list with no change, the only change is to increase the length of varchar type.
7, Description: Add a primary key: Alter table tabname add primary key (col)
Description: Remove the primary key: Alter table tabname drop primary key (col)
8, Description: Create an index: create [unique] index idxname on tabname (col ....)
remove the index: drop index idxname
Note: The index is not changed, want to change to remove the re-construction.
9, Description: create a view: create view viewname as select statement
deleted view: drop view viewname
10, Description: a few simple basic sql statement
select: select * from table1 where range
insert: insert into table1 (field1, field2) values (value1, value2)
delete: delete from table1 where range
updates: update table1 set field1 = value1 where the scope of
Find: select * from table1 where field1 like '% value1%' --- like the syntax is very subtle, information search!
Sort: select * from table1 order by field1, field2 [desc]
Total: select count * as totalcount from table1
sum: select sum (field1) as sumvalue from table1
Average: select avg (field1) as avgvalue from table1
maximum: select max (field1) as maxvalue from table1
Minimum: select min (field1) as minvalue from table1
11, Description: several high-level query operations term
A: UNION operator
UNION operator results through a combination of the two other tables (for example, TABLE1 and TABLE2 ) and to eliminate any duplicate rows in the table derives a result table. When the UNION ALL when used in conjunction with (or UNION ALL), not eliminate duplicate rows. In both cases, derived not from each row of the table is from TABLE1 TABLE2.
B: EXCEPT Operator
EXCEPT operator by including all but not in TABLE2 TABLE1 in the line and remove all duplicate lines and derive a result table. ALL EXCEPT when used in conjunction with the time (EXCEPT ALL), not eliminate duplicate rows.
C: INTERSECT operator
INTERSECT operator by only TABLE1 and TABLE2 in both the line and remove all duplicate lines and derive a result table. When ALL INTERSECT when used in conjunction with (INTERSECT ALL), not eliminate duplicate rows.
Note: Use the operation of several query results word line must be the same.
12, Description: Use outer join
A, left outer join:
left outer join (left join): The result set includes the connection table matches several rows, but also left all the lines connecting the table.
SQL: select aa, ab, ac, bc, (...) , bd, bf from a LEFT OUT JOIN b ON aa = bc
B: right outer join:
the right outer join (right link): result set not only including the connection line to connect the matching table, the table also includes the right to connect all the lines.
C: full outer join:
all external connections: not only match the symbolic link table rows, also includes two connections in the table all the records.
Secondly, we see some good sql statement
1, (...) , Description: Copy table (only copy the structure, the source table name: a New Table Name: b) (Access available)
Act 1 : select * into b from a where 1 1
Method 2: select top 0 * into b from a
2, Description: Copy table (copy the data source table name: a target table Name: b) (Access available)
insert into b (a, b, c) select d, e, f from b;
3, Description: cross-database copy between the tables (specific data using the absolute path) (Access available)
insert into b (a, b, c) select d, e, (...) , f from b in 'specific database' where conditions
example: .. from b in '\Server.MapPath (\select a, b, c from a where a IN (select d from b) or: select a, b, c from a where a IN (1,2,3)
5, Note: Display the article, The author and the final response time
select a.title, (...) , a.username, b.adddate from table a, (select max (adddate) adddate from table where table.title = a.title) b
6 Description: outer join query (table name 1: a table name 2: b)
select aa, ab, ac, bc, bd, bf from a LEFT OUT JOIN b ON aa = bc
7, Description: Online view query (table name 1: a)
select * from (SELECT a, b, c FROM a) T where ta> 1;
8, note: between the use of , (...) , between the data limits the scope of inquiry, including the boundary values, not between not including
select * from table1 where time between time1 and time2
select a, b, c, from table1 where a not between Value 1 and Value 2
9, note: in the use
select * from table1 where a [not] in ('value 1', 'value 2', 'value of 4', 'value of 6')
10, Description: two related tables, delete the main table, the table does not have the information, Deputy
delete from table1 where not exists (select * from table2 where table1.field1 = table2.field1)
11, Description: 4 tables together into the problem:
select * from a left inner join b on aa = bb right inner join c on aa = cc inner join d on aa = dd where .....
12, Note: the schedule for five minutes in advance to remind
SQL: select * from schedule where datediff ('minute', f the start time, getdate ())> 5
13, Description: A database sql statement buttoned page
select top 10 b. * from (select top 20 primary key fields, sort fields from table name order by sort field desc) a, table name b where b. primary key field = a. primary key field order by a. sort field
14, Description: the first 10 records
select top 10 * form table1 where range
15, note : Select the value in each group b the same data in a corresponding record of the greatest of all information (like this forum for a monthly usage can be used to list, selling products of every month, according to subject performance ranking, and so on. )
select a, b, c from tablename ta where a = (select max (a) from tablename tb where tb.b = ta.b)
16, Note: includes all in but in the TableA not TableB and TableC the line and remove all duplicate lines and derive a result table
(select a from tableA) except (select a from tableB) except (select a from tableC)
17, (...) , note : Remove the 10 random data
select top 10 * from tablename order by newid ()
18, Description: The randomly selected records
select newid ()
19, Description: Remove duplicate records
Delete from tablename where id not in (select max (id) from tablename group by col1, (...) , col2 ,...)
20, Description: list of all database table name
select name from sysobjects where type = 'U'
21, Description: The table lists all the
select name from syscolumns where id = object_id ('TableName')
22 Description: shows the type, vender, pcs field to field type arrangement, case can easily achieve multiple choice, similar to the select in the case.
select type, sum (case vender when 'A' then pcs else 0 end), sum (case vender when 'C' then pcs else 0 end), sum (case vender when 'B' then pcs else 0 end) FROM tablename group by type
displayed:
type vender pcs
computer A 1
Computer A 1
CD B 2
CD A 2
phone B 3
Mobile C 3
23, http://www.wholesalesmaccosmetics.com , Description: Initialize the table table1
TRUNCATE TABLE table1
24, Description: Choose from 10 to 15 records
select top 5 * from ( select top 15 * from table order by id asc) table_ aliases order by id desc
random selection method of database records (using the Randomize function, (...) , achieved through the SQL statement)
on the data stored in the database , the random number feature can give the above effect, but they may slow a bit. You can not ask ASP \In fact common solution is to build the cycle as follows:
Randomize
RNumber = Int (Rnd * 499) +1
While Not objRec.EOF
If objRec (\\First, you remove the 1 to 500 within the scope of a random number (assuming 500 is the total number of database records). Then you loop through each record to test the value of ID to check whether it matches RNumber. Meet the conditions, if the implementation of the THEN keyword for the beginning a code. If your RNumber equal to 495, then loop again to the database may take a long time. Although this number seems too big 500, but more stable than an enterprise solution that is a small database, (...) , and the latter is usually within a database that contains thousands of records. This time not on the dead?
using SQL, (...) , you can quickly find accurate records and open only to contain the record of a recordset, as follows:
Randomize
RNumber = Int (Rnd * 499) + 1
SQL = \\As long as you are satisfied with the work of the above code, you can demand action from the \Recordset does not contain other elements, so you can quickly find the records you need so greatly reduce the processing time.
talk about random number
Now you drained Random function is determined to the last drop of oil, then you may take out more than a random record or want to use the records within a certain random. Random example of the above criteria can be expanded about the two cases above, the SQL response.
to take out a few random selection of records and stored within the same recordset, you can store three random numbers, and then query the database match these figures were record:
SQL = \& RNumber & \list), you can use BETWEEN or mathematical equation selected the first record and the appropriate number of incremental records. This operation can be accomplished in several ways, but the SELECT statement shows only a possible (where ID is an automatically generated number):
SQL = \AND \
random reads some records, tested
Access syntax: SELECT top 10 * From the table name ORDER BY Rnd (id)
Sql server syntax: select top n * from table name order by newid ()
MySql Syntax: Select * From Table Name Order By rand () Limit n
Access left connection syntax (use the left to connect the recent development, Access to help nothing, the Internet is not the SQL Access Note that only their own tests, and now record for later inspection)
syntax: Select table1.fd1, table1, fd2, table2.fd2 From table1 left join table2 on table1.fd1, table2.fd1 where ...
use SQL statements instead of long strings with ... show
syntax:
SQL database: select case when len (field)> 10 then left (field, 10 )+'...' else field end as news_name, news_id from tablename
Access database: SELECT iif (len (field)> 2, left (field, 2 )+'...', field) FROM tablename;
Conn . Execute instructions
Execute method
the method used to execute SQL statements. SQL statement is executed according to whether to return record set, use the format of the method is divided into the following two:
1. Implementation of the SQL query, the query will return the resulting recordset. Usage is:
Set the object variable name = connection object. Execute (\method, the Recordset object is assigned to the specified save, after an object variable represents the Recordset object.
2. The operational implementation of SQL language, no records set to return. Use this time to:
connection object. Execute \the number of records are automatically saved to the variable. By accessing the variable, you can know how many SQL statements team records the operation.
? Option Option, the parameter value usually adCMDText, it used to tell ADO, should be after the Execute method of the first character interpreted as a command text. By specifying the parameters could make the implementation more efficient.
? BeginTrans, RollbackTrans, CommitTrans method
these three methods is the connection object to provide methods for transaction processing. BeginTrans for the start of a thing; RollbackTrans used to roll back the transaction; CommitTrans submit all the transactions for the results, that confirm transactions.
transaction can be a set of operations as a whole, all statements are successful only after the execution of the transaction be successful; If one has a statement fails, then the whole deal even if the failure to restore everywhere in the state before .
BeginTrans and CommitTrans used to mark the begin and end, between these two statements, that is, as the transaction statements. To judge the success of the transaction can be set by connecting Error object to achieve, if a member of the collection Error number is not 0, it indicates an error occurs, the transaction failed. Error Error for each collection object, representing an error message.
you find it?
feeling of love, (...) , always very sweet in the beginning,
always feel much more of a stay by one more person to help you share,
you finally no longer alone, at least one person thinking of you,
Lianzhao you, whether to do anything,
long as we can, together, that is good ....
...
.... but slowly, with the deeper understanding of each other,
you begin to discover each other's shortcomings,
The problem occurred one after another ,
you start trouble, tired, or even want to avoid,
Some say love is like picking up rocks,
always want to pick up one for his own,
but how do you know when to picked it?
him / her for you, then you fit him / her do?
In fact, the same love as terrazzo,
may just pick up, you is not so satisfied,
But remember that people are flexible,
many things can be changed,
as long as you determination, courage,
pick around with the unknown stone,
not as good as his Haohao De already have the stone Sharpen, you start to wear it?
Many people think that because the feeling faded,
so talent will become lazy.
wrong!
is conquered people first to be inert,
it will lighten the feeling.
at a dinner occasion,
was suggested that a body good to eat more shrimp,
this time there is a middle-aged man suddenly said, (...) , \My wife was my girlfriend, she said to eat 10 shrimp, I peel 20 to her!
Now, if she wanted me to help her peel shrimp, kidding! I could not even help her to undress no interest, and also shell shrimp in a blanket! \Understand?
No wonder more and more people just want to talk about a lifetime of love,
has refused to marriage.
because marriage is easy to become lazy people.
If everyone
too lazy speech,
too lazy to listen,
too lazy to create surprise,
too lazy tenderness,
then the husband and wife or lovers,
how can not drift away gradually silent then?
* So remember:
dynamic love,
need proper irrigation hospitality,
love, it is not lazy, oh!
a couple, similar to dinner after work, shopping,
but girls because the company delayed the meeting,
when she arrived at a time when Mao Zhaoyu has been late more than 30 minutes,
his boyfriend was very unhappy to say:
you every time so I have not had any mood,
I will not do so on you!
of a sudden, the girl finally burst their banks collapsed,
she thought to myself: Maybe they never had
the same future in the same place, another couple is facing the same situation;
too late when the girls arrived half an hour, (...) ,
his boyfriend, said: \rain off his coat and cap to girls,
at the moment, the girl in tears
but flow through her tears on my face is warm.
you feel it?
fact, love, hate often just one of our idea!
love not only to know how to be more tolerant to time,
is a lot of things may just change your mind too!
understand?
when individuals fall in love with you, and you feel good to him.
that does not mean you would choose him.
We always said: \but you can not answer him, because you do not know.
Yes, we always thought we would find a people who themselves love love.
but later, when we suddenly look back, we will have found themselves how naive.
if never started, you know how that person will love love it?
fact, love the feeling of love is to experience the many things together until after the discovery.
Perhaps everyone wants to be able to find their partner in mind 100 percent,
『but you have not thought about early in your side would have been silent for a long time for you to pay, but you do not find it? 』
It, or look at the people around it! He may have been waiting for you for a long time
When you love someone, love to just eight absolute good.
all the expectations and hopes are only Qiba Fen; the remaining two or three minutes to love myself.
If you continue to love more, give the other party is likely to pressure for each breath,
completely lost the love of fun.
So remember,
drink no more than six drunk,
eat no more than seven full,
love a person no more than eight
If you is also for love lost, perhaps the following passage can give you some inspiration:
love a person, to understand, but also open solution;
to apologize, but also thanks;
to admit his fault, but also error correction;
be considerate, but also understanding;
is to accept, not tolerate;
is tolerance, not condoned;
is to support, not dominate;
is sympathy, not asked;
is talk, not complaints;
is memorable, but not forgotten;
is mutual exchanges, instead of having accountability;
is quietly praying for each other,
rather than the many other demands;
can be romantic, but do not waste;
`* Do not hold hands,
` * more Do not let go
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