AUTO INCREMENT Field Auto-increment allows a unique number to be generated automatically when a new record is inserted into a table. Often this is the primary key field that we would like to be created automatically every time a new record is inserted. Syntax for MySQL CREATE TABLE Persons ( ID int NOT NULL AUTO_INCREMENT, LastName varchar( 255 ) NOT NULL , FirstName varchar( 255 ), Age int, PRIMARY KEY (ID) ); Syntax for SQL Server CREATE TABLE Persons ( ID int IDENTITY ( 1 , 1 ) PRIMARY KEY , LastName varchar( 255 ) NOT NULL , FirstName varchar( 255 ), Age int ); for Select Query SQL SERVER SELECT ROW_NUMBER () OVER ( ORDER BY FirstName, LastName) Sequence_no , LastName , FirstName FROM Persons for Select Query MySql SELECT @ n := @ n + 1 n , FirstName , LastName FROM Persons , ( SELECT @ n := 0 ) m ORDER BY
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