sql server auto increment primary key

Deletes all indexes of the specified table, including primary key indexes, unique indexes, and normal indexes, for SQL Server 2005,Instructions for use:1. Execute the script first to create the stored procedure in the database2, call the method, take the gold partner database as an exampleUse VELCROMFM--database name,

(select Top 5 code from Renyuan)Select top 5*from Renyuan where code not in (select Top ten code from Renyuan) --a total of a few pagesSelect CEILING (COUNT (*)/5.0) from Renyuan --Find out all information about people older than 35 years in the sales department SELECT * from Renyuan where code in(select code from Renyuan where age>35 and ygbm=(select Bmcode from bumen where bmname= ' sales Department ')) --View all personnel information and replace the department number with the department nam

In SQL SERVER if we want to make the primary key grow automatically according to certain rules we can do this: Here we have a new research table with research IDs, names of researchers and research hospitals. We set the SICENTIFICID as the primary

Background:Self-growth is a very common data attribute, and in MySQL everyone is willing to let the field of the self-growth attribute be a primary key. In particular InnoDB, because of the characteristics of the InnoDB clustered index, using fields from the growth property when the primary key performs better, here ar

/* Create a table without automatic identification */Create Table Product(PID Number (15) primary key not null,Pname varchar2 (20) not null);Commit; Insert into product (PID, pname) values (1, 'mydrian ');Commit; /* Clear table records */ Truncate table product;Commit; Select * from product;/* View the table structure */Desc Product Drop table orders;/* Create a table with automatic identification */Cr

Tags: mat and products Type way query data str whereMode 1: Select b.column_name from information_schema.table_constraints a inner join information_schema.constraint_column_usage b = b.constraint_name where ' PRIMARY KEY ' ' Products ' Go Mode 2: SELECT A.name From syscolumns a inner joins sysobjects d on a.id=d.id where d.name= 'products'1where xtype='PK' And in (the SELECT

algorithm is generated by Ethernet card address, nanosecond time, chip ID code, and many possible digits. The format is: 04755396-9a29-4b8c-a38d-00042c1b9028. The advantage of a GUID is that the generated ID is unique, whether you are exporting data or doing step-by-step development, there is no problem. However, it generates a long ID, the database space to occupy more, with the loss of external storage prices, this also need not be considered. In addition, the GUID is not easy to remember, i

Label:One. Turn off automatic identity column auto-growth:The command required for the operation is: SET Identity_insert [table][on| OFF] After the parameter is "on", means: Open the Identity column manual insertion function. Once the command execution succeeds to insert data into the table thereafter, the automatic identity column will not grow automatically, and the contents of this column need to be inserted manually. Of course, after the data addi

This morning, I learned about the use of primary and foreign keys in SQL Server and how to establish the connection between primary key and foreign key.In the afternoon, I learned how to apply the subquery inside SQL

GUID, UUID)2. Using an identity column to implement field self-increment avoids problems such as concurrency, and does not allow developers to control their own growth. Fields with an identity column do not specify the value of the primary key when you insert it. Set the IS Identity column of the field to Yes, and a table can have only one identity column.3. The

Label:Sometimes to get the table primary key field, although the system from the stored procedure can be obtained, but for familiar with the system table, it is easy to write yourself.2 Declare @table_name varchar 3 Set @table_name = ' Table_pqs ' 4 --1, according to system stored procedure 5 Execute Sp_pkeys @table_name 6 7 --2, obtained 8 Declare @objectid int 9 Set @

Label:Soft code generator in SQL Server, the generated code incorrectly identifies a unique index as the primary key.After you decompile the source code, you find that the SQL condition is incorrect, and now fix the bug.FIX: Replace the "Maticsoft.DbObjects.dll" in the attachment with the relevant files in the installa

Label:The following code has been found on the Internet:DECLARE @Pk varchar (100);Select @Pk =name from sysobjects where parent_obj=object_id (' table name ') and xtype= ' Pk ';If @Pk is not nullBeginEXEC (' Alter table name Drop ' + @Pk)--Delete the primary keyEndThe point here is that the table Sysobjects,sysobjects table is a system table, each object created in the database (constraints, defaults, logs, rules, stored procedures, etc.) in the table

The problem is simple: the attribute aid in tableA is the auto-increment primary key, the attribute bid in tableB is the auto-increment primary key