sql create table primary key autoincrement

GO--determine if the table exists in the way 1if object_id(N'Ef_user'N'U') is NULL--determine if the table exists in the way 2--If not EXISTS (SELECT * FROM dbo. SysObjects WHERE id = object_id (N ' [Ef_user] ') and OBJECTPROPERTY (ID, ' istable ') = 1)begin--directly create a table with the self-increment and specify

DECLARE iCount number (2): = 0; begin select count (*) INTO iCount FROM user_sequences u WHERE u. sequence_name = 'seq _ TCAPITALNOTIFY '; www.2cto.com IF iCount = 0 THEN/* create sequence */execute immediate 'create sequence SEQ_TCAPITALNOTIFY minvalue 1 nomaxvalue start with 1 increment by 1'; end if; select count (*) INTO iCount FROM user_tables u WHERE u. TABLE_NAME = 'tcapital=y '; IF iCount = 0 THEN/*

Original: Deletes all indexes of the specified table, including primary key indexes, unique indexes, and normal indexes, for SQL Server 2005.Deletes all indexes of the specified table, including primary

Label: Introduction This article focuses on the use of sequences in Oracle if you create a self-growth table. Create Tabletb_student (ID Number(Ten) not NULL, Createtime DATE not NULL, constraintPk_tb_studentPrimary Key(ID)); Comment on Table"Tb_student" is ' StudentTab

The role of the primary key: 1) To ensure the integrity of the entity; 2) speed up the operation of the database 3) when you add a new record to a table, the database automatically checks the primary key value of the new record and does not allow the value to repeat with the

My BSOOC needs a query table primary key foreign key information SQL, last night to study until 1 o'clock in the morning, finally to achieve this goal:Oracle:Select O.obj# as ObjectId, o.name as TableName, oc.name as ConstraintName,Decode (c.type#, 1, ' C ', 2, ' P ', 3, ' U

Explore how SQL uses INFORMATION_SCHEMA system view to obtain the table's primary and foreign key information bitsCN.com 《 Parsing SQL table structure information query includes primary and foreign keys, auto-incrementThe INFORMAT

. Because the field is to be the primary key for a table, the first condition is to ensure uniqueness in the table. At the same time, combining the characteristics of the SQL Server database itself, you can create a self-adding c

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 databas

Original: MS SQL Server searches for the column name of a table's primary keySELECT syscolumns. Name from syscolumns,SYSOBJECTS,sysindexes,SysindexkeysWHERE syscolumns. ID =object_id(' tab_xxx ')--syscolumns.id The Table object ID that the column belongs to andSYSOBJECTS. Xtype =' PK ' --sysobjects.xtype Object TypeandSYSOBJECTS. Parent_obj =syscolumns. IDandsysi

must comply with the identifier rules. For more information, see use identifiers. The specified table must contain an ID column. Noreseed Specifies that the current ID value should not be corrected. Reseed Specifies that the current ID value should be corrected. New_reseed_value Is the value to be used when the value is re-assigned in the ID column. Note If necessary, DBCC checkident will correct the current ID value of the column. Howev

Tags: des blog http io ar os sp div onOriginal: Deletes all indexes of the specified table, including primary key index, unique index, and normal index, for SQL Server 2005,--Delete all indexes in the specified table--usage: DECLARE @tableName varchar--set @tableName = '

Keytablename (:D Elibase:delord-Delord) Set @table Namestartpos=patindex ('%base:% ', @KeyTableName) if @tableNameStartPos >0set @KeyTableName =substring (@ Keytablename, @TableNameStartPos +5,len (@KeyTableName) [emailprotected]) Set @HeadStr = @PrefixSet @preFixStr = " If @CodeType = ' 1 ' beginif @FirstLoop = ' 1 ' Set @tmpstr = Cast ((@CurrentCode + 1) as Varchar) Else beginset @tmpstr = Ca St ((@CurrentCode + 1) as Varchar) Set @CCode = @Current

In the development process, we will use some initialization statements, because of the foreign key relationship, we need to write some ID to die, then when we are initialized, we need to increment the table in MySQL from a certain value of the primary key.ALTER TABLE ' system_role_menu ' auto_increment = 11;The

for replication clause (in the create table or alter table statement), the current ID value is not corrected. If the primary key or unique key constraint exists in the ID column, invalid ID information may cause error 2627. The s

Label:SQL inserts data into the table with the primary key self-increment 1. Building an Index --Create sequence create sequence seq_new_old_mge minvalue 1400 maxvalue 999999999999999999999999999 start with 1420 increment by 1 cache 20; Note:

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

Select Syscolumns . Name From Syscolumns , Sysobjects , Sysindexes , Sysindexkeys Where Syscolumns . ID = Object_id ( 'Tab _ XXX' ) -- Syscolumns. ID is the table Object ID of the column. And Sysobjects . Xtype = 'Pk' -- Sysobjects. xtype object type And Sysobjects . Parent_obj = Syscolumns . IDAnd Sysindexes . ID = Syscolumns . IDAnd Sysobjects . Name = Sysindexes . NameAnd Sysindexkeys . ID =Syscolumns . IDAnd Sysindexkeys . Indid = Sysind

systypes table, the general user uses the data type to use the Xusertype correspondence is better, does not appear one to many the situation.(c) Syscolumns.length gets the length of the physical memory, so the types of nvarchar and varchar are displayed in the database in half.24.25.4. Get the column names contained in the primary key in the

. Because the field is to be the primary key for a table, the first condition is to ensure uniqueness in the table. At the same time, combining the characteristics of the SQL Server database itself, you can create a self-adding c