下列Transact-SQL 指令碼的第一部份僅供解說之用。 您可以執行開頭是下列註解的 Transact-SQL 指令碼:-- Create the img table。 SQL 複製 -- Here is the generic syntax for finding identity value gaps in data. -- The illustrative example starts here. SET IDENTITY_INSERT tablename ON; DECLARE @...
There are several ways in sql server, to retrieve the last identity value that is generated. The most common way is to use SCOPE_IDENTITY() built in function. Apart, from using SCOPE_IDENTITY(), you also have @@IDENTITY and IDENT_CURRENT('TableName') function. Example queries for getting...
而IDENT_CURRENT('T1') 和 IDENT_CURRENT('T2') 返回的值分别是这两个表最后自增的值。 【Example】 也许大家对SQL Server中的 @@IDENTITY 都不陌生,都知道它是获取数据表中最后一条插入数据的IDENTITY值。比如,表 A 中有个 ID 为自增1的字段,假设此时 ID 的值为100,现在如果我往表A插入一条数据,并在...
The first part of the following Transact-SQL script is designed for illustration only. You can run the Transact-SQL script that starts with the comment:-- Create the img table. SQLCopy -- Here is the generic syntax for finding identity value gaps in data.-- The illustrative example starts...
Because this function creates a column in a table, a name for the column must be specified in the select list in one of the following ways:SQL Copy --(1) SELECT IDENTITY(int, 1,1) AS ID_Num INTO NewTable FROM OldTable; --(2) SELECT ID_Num = IDENTITY(int, 1, 1) INTO New...
For example, an Identity Column is normally used to identify a newly added record. When the Identity Column is not used, Access may be unable to correctly find the newly added row, which will cause the fields in that row to show as #Deleted. You ...
The following example creates a table with an identity column and shows how the SET IDENTITY_INSERT setting can be used to fill a gap in the identity values caused by a DELETE statement.SQL Másolás USE AdventureWorks2022; GO -- Create tool table. CREATE TABLE dbo.Tool( ID INT ...
in a topology. For example, if you usesmallintstarting at 1 with an increment of 1, the maximum number of inserts is 32,767 for the Publisher and all Subscribers. The actual number of inserts depends on whether there are gaps in the values used and whether a threshold value is used. ...
For example, an Identity Column is normally used to identify a newly added record. When the Identity Column is not used, Access may be unable to correctly find the newly added row, which will cause the fields in that row to show as #Deleted. ...
The following example creates two tables, TZ and TY, and an INSERT trigger on TZ. When a row is inserted to table TZ, the trigger (Ztrig) fires and inserts a row in TY. SQL Copy USE tempdb; GO CREATE TABLE TZ ( Z_id INT IDENTITY(1,1)PRIMARY KEY, Z_name VARCHAR(20) NOT NUL...