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In a future version of SQL Server, ANSI_NULLS will always be ON and any applications that explicitly set the option to OFF will generate an error.

If SET ANSI_NULLS is not specified, the setting of the ANSI_NULLS option of the current database applies.For more information about the ANSI_NULLS database option, see ALTER DATABASE (Transact-SQL).SET ANSI_NULLS ON affects a comparison only if one of the operands of the comparison is either a variable that is NULL or a literal NULL.If both sides of the comparison are columns or compound expressions, the setting does not affect the comparison.For a script to work as intended, regardless of the ANSI_NULLS database option or the setting of SET ANSI_NULLS, use IS NULL and IS NOT NULL in comparisons that might contain null values.SET ANSI_NULLS should be set to ON for executing distributed queries.

SET ANSI_NULLS must also be ON when you are creating or changing indexes on computed columns or indexed views.

If SET ANSI_NULLS is OFF, any CREATE, UPDATE, INSERT, and DELETE statements on tables with indexes on computed columns or indexed views will fail.

SQL Server will return an error that lists all SET options that violate the required values.

Also, when you execute a SELECT statement, if SET ANSI_NULLS is OFF, SQL Server will ignore the index values on computed columns or views and resolve the select operation as if there were no such indexes on the tables or views.

ANSI_NULLS is one of seven SET options that must be set to required values when dealing with indexes on computed columns or indexed views.

The options ANSI_PADDING, ANSI_WARNINGS, ARITHABORT, QUOTED_IDENTIFIER, and CONCAT_NULL_YIELDS_NULL must also be set to ON, and NUMERIC_ROUNDABORT must be set to OFF.