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3 The SQL Language : 3.5 Functions and Operators

Advanced Server provides a large number of functions and operators for the built-in data types.
SQL uses a three-valued Boolean logic where the null value represents "unknown". Observe the following truth tables:
The operators AND and OR are commutative, that is, you can switch the left and right operand without affecting the result.

3 The SQL Language : 3.5 Functions and Operators

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