Description

Predicate functions and operators check if the input argument satisfies a condition.

Predicate Function

The ISNULL function checks if the input value is NULL and returns 1 if the input value is NULL, and 0 (as an INT) otherwise.

Predicate Operators

• Predicate operators may match the values of a column with a list of match values (IN) or a match pattern (LIKE) and return true if the value of a column matches.
• The BETWEEN operator matches an inclusive range between two given values.
• In contrast to the ISNULL function, which returns an INT, the IS NULL operator returns true if the input is NULL, and false otherwise.

The output of IN, LIKE, BETWEEN and IS NULL can be negated by using NOT IN, NOT LIKE, NOT BETWEEN and IS NOT NULL respectively.

IN, LIKE, BETWEEN and IS NULL must be used together with one of the following operators which are evaluating the return value:

• CASE WHEN
• FILTER
• Pull-Up-Functions

Predicate operators can be combined with logical operators to more complex boolean expressions.