![]() When SET ANSI_NULLS is OFF, these operators treat NULL as a known value, equivalent to any other NULL, and only return TRUE or FALSE (never UNKNOWN). When SET ANSI_NULLS is OFF, the same rules apply, except for the equals (=) and not equals () operators. When SET ANSI_NULLS is ON, an operator that has one or two NULL expressions returns UNKNOWN. Unlike other SQL Server data types, a Boolean data type cannot be specified as the data type of a table column or variable, and cannot be returned in a result set. Expressions that return a Boolean data type are known as Boolean expressions. ![]() This has three values: TRUE, FALSE, and UNKNOWN. via a feed in XML format is text based and hence understandable by an end user. as shown:
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