Identity « Sequence Indentity « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Sequence Indentity » Identity

15. 1. Identity
	15. 1. 1.	Using the IDENTITY Property and the IDENTITY() Function
	15. 1. 2.	Syntax for Using the IDENTITY() Function
	15. 1. 3.	Create table with IDENTITY column
	15. 1. 4.	Generating IDENTITY values
	15. 1. 5.	Cannot insert explicit value for identity column in table 'T' when IDENTITY_INSERT is set to OFF.
	15. 1. 6.	IDENTITY/NOT NULL/PRIMARY KEY
	15. 1. 7.	IDENTITY(100, 20)
	15. 1. 8.	Identity column
	15. 1. 9.	SELECT Statement and IDENTITY Property
	15. 1. 10.	Identity: A numerical value automatically assigned to a row any time a new row is added.
	15. 1. 11.	Supported data types for the IDENTITY property are TinyInt, SmallInt Int, BigInt, Decimal, and Numeric.
	15. 1. 12.	A table could also be created so that the seed value was negative and the increment was positive:
	15. 1. 13.	The IDENTITY property must be temporarily turned off when inserting a specific value.
	15. 1. 14.	SQL Server will choose the highest number as its current seed for a positive increment value or the lowest for a negative increment value.
	15. 1. 15.	Saving the @@IDENTITY Value in a Variable
	15. 1. 16.	SQL Server provides the @@IDENTITY global variable to hold that value.
	15. 1. 17.	Altering the Table to Add an Identity Column
	15. 1. 18.	Check @@IDENTITY value
	15. 1. 19.	Query a view with four table join
	15. 1. 20.	Retrieving the Maximum Value of key_col from MyTable
	15. 1. 21.	Query that Returns Result Row Numbers, Starting with 1 and Incrementing by 3
	15. 1. 22.	Storing the Results in a Temporary Table Using the IDENTITY() Function

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