sql server auto increment primary key

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SQL statement modifies the MySQL table's self-increment primary key

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 tabl

Primary key, self-increment primary key, primary key index, unique index concept difference and performance difference

; Auto-increment primary key > Primary key (primary key index)Insert: primary

SQL inserts data into the table with the primary key self-increment

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: Create sequence seq_new_old_mge, Min. 1400, Max 999999999999999999 (I don't k

Advantages and disadvantages of SQL GUID and auto-increment key

using the GUID master key:1, storage space is large (in bytes), so it will take up more disk size.2, difficult to remember. Join operation performance is lower than Int.3. There is no built-in function to get the newly generated GUID primary key.4. The GUID master key will be added to the other indexes on the table, t

Advantages and disadvantages of SQL GUID and auto-increment key

-server data merging is very convenient.Disadvantages of using the GUID master key:1, storage space is large (in bytes), so it will take up more disk size.2, difficult to remember. Join operation performance is lower than Int.3. There is no built-in function to get the newly generated GUID primary key.4. The GUID maste

Setting a non-primary key as a clustered index SQL Server Index Structure and usage (I) SQL Server Index Structure and usage (ii) SQL Server Index Structure and usage (III) SQL Server Index Structure and usage (4)

---- Set a non-primary key to clustered index [Step 4] to: http://king123654789.iteye.com/blog/1169191 1. View All indexes. Clustered indexes are created on the primary key by default.Sp_helpindex person 2. -- delete the primary key

Adjust the current initial value of the auto-increment field in SQL Server

A few days ago, when I upgraded the database of a communtiy server from SQL 2000 to SQL 2005, I encountered a strange problem and reported the following error: Violation of primary key constraint 'pk _ cs_threads'. Cannot insert duplicate

SQL Server auto-increment Column

Declare @ table_name varchar (60) Set @ table_name = ''; If exists (select top 1 1 from sysobjectsWhere objectproperty (ID, 'tablehasauth') = 1And upper (name) = upper (@ table_name))Select 1Else select 0 -- Or If exists (select top 1 1 from sysobjects soWhere so. xtype = 'U'And upper (so. Name) = upper (@ table_name)And exists (select top 1 1 from syscolumns SCWhere SC. ID = So. IDAnd columnproperty (SC. ID, SC. Name, 'isidentity ') = 1))Select 1Else select 0 Determine whether the tab

SQL SERVER auto-increment Column

Declare @ Table_name varchar (60) Set @ Table_name = ''; If Exists (Select top 1 1 from sysobjectsWhere objectproperty (id, 'tablehasauth') = 1And upper (name) = upper (@ Table_name))Select 1Else select 0 -- Or If Exists (Select top 1 1 from sysobjects soWhere so. xtype = 'U'And upper (so. name) = upper (@ Table_name)And Exists (Select Top 1 1 from syscolumns SCWhere SC. id = so. idAnd columnproperty (SC. id, SC. name, 'isidentity ') = 1))Select 1Else select 0 Determine whether the Table has an

Oracle Build table sql+ Self-increment primary key

Label:exenotseledropclass prerop CREATE TABLE create sequence --CREATE TABLE Bonus_benchmark_ VALUE---------------------------------------------------------------declare num number; Begin select COUNT (1) into NUM from user_tables WHERE table_name = UPPER (' Bonus_benchmark_value '); If Num>0 then execute immediate ' drop table Bonus_benchmark_value '; End If; end;/--------------------------------Table structure for bonus_benchmark_value------------------------------ CREATE TABLE bonus

Adjust the current initial value of the auto-increment field in SQL Server

A few days ago, when I upgraded the database of a Communtiy Server from SQL 2000 to SQL 2005, I encountered a strange problem and reported the following error:Violation of primary key constraint 'pk _ cs_threads'. Cannot insert duplicate

"PHP" MySQL gets the primary key for inserting data (self-increment id), MySQL primary key _php tutorial

"PHP" MySQL gets the primary key for inserting data (self-increment id), MySQL primary key To prevent primary key collisions, the self-increment

SQL Server Auto Increment-trace flag 272

Starting with SQL 2012, Microsoft has made a cache mechanism to make insert auto increment faster.Although this mechanism is good, but also has the troublesome situation, if your SQL suddenly restart, then this cache losesThis time causes your SQL

SQL Server database auto-increment ID column update and Modification Operation Method

In daily SQL Server development, identity columns of the Identity type are often used as the auto-increment numbers of a table structure. For exampleArticleNumber, record number, and so on. The reference of the Self-increasing ID column greatly facilitates the databaseProgramDevelopment, but sometimes this stubborn fie

Set auto-increment fields in SQL Server

What is the auto-increment field in SQL Server (like the serial number sequence in Oracle? How to use it? 1. Create Table Name (Field name [int] identity (1, 1) not null,...) 2. in SQL Server, All Integer columns can be defined a

Remove the newly inserted primary key (the primary key is the GUID type) in SQL Server

Create PROCEDURE pro_test (@userName NVARCHAR ( -) ) as--Select* from[dbo]. [Table_2]--SELECT *From [dbo]. [Student] Beginbegin TRAN DECLARE @tempTable TABLE (tempid uniqueidentifier) DECLARE @tempId uniqueidentifier INSERT into tabl E_2 (UserName) OUTPUT Inserted.userid into @tempTable VALUES (@userName)--insert data into the first table SELECT @tempId=tempid from @tempTable--assign a value to the middle variable INSERT into dbo. Student (Stuname, Stuage, Stusex,stucode) VALUES ('Zhansan',Ten,'

In mybatis data table (mysql), the primary key does not grow. how do I insert data (primary key needs to be inserted) to achieve auto growth of the primary key?

For example, there are three fields: Table person, person, id (mysql database, primary key, non-auto-increment), and name and pswd. In the case of auto-increment, we usually process insertintoperson (name, pswd) values (# {name},

SQL Server calculates the number of table records, current auto-increment value, and occupied space

The number of records in the SQL server computing table, the current auto-increment value, and the occupied space are not SELECTTableNameobj. name, TotalRowsprt. rows, Identity_CurrentIDENT_CURRENT (obj. name), [SpaceUsed (KB)] SUM (alloc. used_pages) * 8FROMsys. objectsobjJOINsys. indexesidxonobj. object_idi No SELECT

Paging Statement-Take the 31st to 40th record in the SQL table (the auto-Grow ID is the primary key)

() {} Finnaly { if (rs!=null) Try{rs.close ();} catch (Exception e) {} if (STM ...). If (CN ... ...). } 3. Scrollable cursors pagesize=20; PageNo = 5; CN = NULL stmt = null; rs = null; Try { Sqlserver:sql = "SELECT * from articles"; DataSource ds = new InitialContext (). lookup (Jndiurl); Connection cn = Ds.getconnection (); "SELECT * from user where id=?" --->binary directive PreparedStatement pstmt = cn.preparesatement (sql,resultset.type_scroll_

SQL Server adds attributes (auto-increment) to tables that have been created

When you create this table, set the ID to type int, and then set the identity to Yes and the seed to 1 increments.If this table is already built, you can add a field called ID at the end, and then do the same as above, then save to add. (Be sure to set it up after saving)ALTER TABLE student Add ID int identity (up to)After saving a new column ID, in the table design to delete the primary key, the ID moved t

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