Point 1:- RAISERROR is used to raise error / warning back to the application or a catch block.

Point 2:- Syntax of RAISERROR is as below

RAISERROR (@Messageid -- Error message number stored in Sys.messages table
           @ErrorSeverity, -- Severity ( 0-25)
           @ErrorState -- State
	   @ErrorMessage, -- Error message string
	   );

Point 3:- You can raise system error message or user defined error message. For user defined error messages it should be greater than 50000.

Point 4:- If you do not specify the error number the error message id is considered 50000 (user defined error message)

Point 5:- Error severity defines how serious the error is. Severity levels from 0 through 18 can be specified by any user. Severity levels from 19 through 25 can only be specified by members of the sysadmin.

Point 6:- If error is raised from multiple location you can use this number to define from which location the error is raised.

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