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  1. Preface
  2. Function reference
  3. Constants
  4. Operators
  5. Dates
  6. Functions
  7. System variables
  8. Datatype reference

Function Reference

Function Reference

Nulls with operators

Nulls with operators

Any expression that uses operators (except the string operator ||) and contains a null value always evaluates to NULL. For example, the following expression evaluates to NULL:
8 * 10 - NULL
To test for nulls, use the ISNULL function.

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