sql primary key autoincrement

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. IDandsysindexes. ID =syscolumns. IDandSYSOBJECTS. Name

Label:How to obtain primary foreign key relationships in SQL Server 2008:Transferred from: http://www.cnblogs.com/ke10/archive/2012/06/11/2544655.htmlSELECT object_name (con.constid) ' Relationship name ',object_name (Sf.fkeyid) ' primary key table ',Fcol.name '

Misunderstanding of SQL Server clustered index and primary key Many people may mix the primary key and clustered index, or think this is the same thing. This concept is very incorrect. A primary

withno_logDBCCshrinkdatabase (database name)execsp_dboption \'database name \', \'autoshrink\', \'true\' \\\'Add field General function Sub AddColumn (tablename,columnname,columntype) Conn.execute (\ "Alter Table \" tablename\ "add \" columnname\ "\" columntype\ "\") End Sub \\\'Change the field general function Sub Modcolumn (tablename,columnname,columntype) Conn.Execute(\"Alter Table\"TableName\"Alter Column\"ColumnName\" \"ColumnType\"\") EndSub \\\'Check if the table exists

Oracle Database primary key auto-increment SQL We all know that in MySQL, it is very easy to implement automatic increment of primary keys. you only need to add auto_increment after the primary key definition, but this is not the

transactions. The user name is written to the users table, and the department it owns is written to the Userdepart table, and the transaction mechanism is used to ensure that the two steps either succeed at the same time or fail at the same time. The problem is that when the first step is complete, we don't know what the value of the Id_user to write to the second step, because this value is automatically generated by SQL Server. Solution Ideas: You

SQL PRIMARY KEY Instance Tutorial Database PRIMARY KEY constraintThe PRIMARY KEY constraint uniquely identifies each record in a database table.The

-- SQL creates a primary key for all user data tables in the database-- Primary key Description: The name is ID, and the data type is Integer auto-increment. -- Query all constraints of the current database before creationSelect * From information_schema.key_column_usage

Label:Establish dept and EMP Tables, and set the foreign keys of the EMP table with the dept_id in the Dept table CREATE TABLE Dept ( dept_name nvarchar () not NULL, dept_address nchar (+), dept_id int constraint pk_ Dept PRIMARY key --dept table's primary key, named Pk_dept ) CREATE TABLE emp ( emp_name n

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 = @CurrentCode + 1Update keycodeSet Currentcode =cast (

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, replace with specific itemGoDECLARE @tableNam

From: http://www.javaeye.com/topic/215571 In the sqlmap configuration file of ibatisSelectkeyElement hasTypeAttribute, which can be specifiedPreOrPostIndicates that (Pre) Or generate later (Post). Oracle settingsXML Code Id = "insertproduct-Oracle" parameterclass = "com. domain. Product"> Resultclass = "int" keyproperty = "ID" type = "pre"> Ms SQL Server ConfigurationXML Code Id = "insertproduct-MS-

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 = ' table name '-The table name, replacing--exec Sp_dropindex according to the actual situation @

(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 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 table above indicates that the System_role_menu table increments from 11 and the next inserted va

Subject: How to write an SQL statement that modifies the field type to "ID" and sets this field as the primary key ?? Author: China_skag () Level 1: Reputation value: 100 Forum: MS-

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 key and start at 1 each

Label:Add the settings for the database multi-field composite primary key.First, a table cannot have more than one primary key. But there are multiple fields that can be combined into one primary key, which is why sometimes the table has multiple fields with a

Tags: ted use _id value gen ATI Save key lastMyBatis getting the self-increment primary key when inserting Method has two Method 1: Insert into person (NAME,PSWD) VALUES (#{name},#{pswd}) Method 2: Select LAST_INSERT_ID ()Insert into person (NAME,PSWD) VALUES (#{name},#{pswd}) The entity id attribute before insertion is 0; The entity id attribute after insertio

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