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-- SQL deletes the primary keys of all user data tables in the database.
-- Query all constraints of the current database before deletionSelect * from information_schema.key_column_usage
Declare @ TableName nvarchar (250)-- Declare that the cursor mycursor1 is used to read all
There are a couple of concepts to talk about before you start."Overwrite Query"When an index contains all the columns referenced by a query, it is often referred to as an "overwrite query.""Index Overlay"If the returned data column is contained in the key value of the index, or is contained in the key value of the index + the key value of the clustered index, then Bookup Lookup does not occur, because the i
-increment column from the table. It then creates a sequence that does not have a cache function, inserting values based on this sequence. Here is the sample code: CREATESEQUENCE id_sequence as INTSTART with 1INCREMENT by 1MINVALUE0no MAXVALUE no CACHEInsert intoMytesttableValues(NEXTVALUE forId_sequence,'Mr.tom'); Insert intoMytesttableValues(NEXTVALUE forId_sequence,'Mr.jackson'); Registering Startup Parameters-t272 Open
In SQL server, how can I use SQL statements to add comments to the column of a table? I didn't use SQL statements to add them before, but I added them to Enterprise Manager: (I checked the information, microsoft introduced extended attributes in
Two methods for SQL to find the intersection of two tables
Dept Table
ID DeptID1 202 203 20
User table
ID UserID1 332 343 34
Method One
SELECT DISTINCT UserID
From User U
where ID in (SELECT ID from dept where deptid=20)
And NOT EXISTS (select 1 from user where ID in (select IDs from dept deptid=20) and Userid
Method two Join
SELECT DISTIN
Obtain table records of all tables and SQL statements that use space
Exec sp_msforeachtable@ Precommand = N'Create Table ##(Id int identity,Table Name sysname,Number of fields int,Number of records int,Reserved space nvarchar (10 ),Use space varchar (10 ),Index space varchar (10 ),Unused space varchar (10 ))',@ Command1 = n' insert ## (Table Name, number of reco
Label:--Read all table names in the library
select name from sysobjects where xtype= ' u '
-Reads all column names of the specified table
select name from syscolumns where Id= ( Select Max (id) from sysobjects where xtype= ' u ' and name= ' table name ')
gets the role of database table names and fields
in SQL
:.. From B in
"server.mappath (". ") "\data.mdb" "where."
24. Create a Database
CREATE DATABASE Database-name
25. Note: Delete database
Drop Database dbname
26. Note: Back up SQL Server
---Create
Device of Backup data
Use master
EXEC sp_addumpdevice disk, Testback,
C:\mssql7backup\MyNwind_1.dat
---start Backup
BACKUP DATABASE pubs to Testback
27. Note: Create a new table
CREATE TABLE TabNam
a temporary table in the database. Therefore, there is another saying about temporary tables in ORACLE databases. We generally say that the temporary table of the ORACLE database is permanent, but the content of the temporary table is temporary. You only need to call the temporary table directly when you need it, instead of creating it temporarily. Unlike the SQL SERVE
exists, the attribute belongs to the current database. If you specify the object type and name, you must also specify the parent object and type. Otherwise, SQL Server produces an error.
Permission
Members of the db_owner and db_ddladmin fixed database roles can add extended attributes to any object. Users can add extended attributes for their own objects. However, only db_owner can add attributes to the u
]) on [primary] Go SQL Server temporary tables can be modified after they are created, including:
1) Add, modify, and delete columns. For example, the column name, length, data type, precision, number of decimal places, and null can be modified, but there are some restrictions.
2) You can add or delete primary keys a
on partitioned tables are faster than those on non-Partitioned Tables, because operations on partitioned tables use parallel operations of CPU and I/O, the amount of data retrieved also decreases, and the time consumed for Locating data becomes shorter.
4
Conclusion
Processing massive data has always been a headache. The separation technology is the first consid
= ' physical ', score = physical FROMTB) TBy name, case course when ' language ' then1when ' math ' then2when ' physical ' then3EndName Course Score---------- ---- -----------John Doe Language 74John Doe Mathematics 84John Doe Physics 94Zhang San language 74Zhang San Mathematics 83Zhang San Physics 932. Using SQL Server 2000 dynamic SQL--
The SQL code in this article can be simply executed in the enterprise manager and query analyzer to identify all the data dictionaries of SQL Server 2000 and SQL Server 2005. (Note: database dictionaries include table structures (
', score = physical FROMTB) TBy name, case course when ' language ' then1when ' math ' then2when ' physical ' then3EndName Course Score---------- ---- -----------John Doe Language 74John Doe Mathematics 84John Doe Physics 94Zhang San language 74Zhang San Mathematics 83Zhang San Physics 932. Using SQL Server 2000 dynamic SQL--
course when ' language ' then1when ' math ' then2when ' physical ' then3EndName Course Score---------- ---- -----------John Doe Language 74John Doe Mathematics 84John Doe Physics 94Zhang San language 74Zhang San Mathematics 83Zhang San Physics 932. Using SQL Server 2000 dynamic SQL--sql
groupId = '# 1' doesn't select data from table_left where groupId =' #11'
Similarly, we perform the "distinct T" set operation on column data for groups #11 in table_left and #2 in table_right, for example:
Copy codeThe Code is as follows: select data from table_left where groupId = '# 11' doesn't select data from table_right where groupId =' #2'
Select data from table_right where groupId = '# 2' doesn't select data from table_left where groupId ='
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