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3 The SQL Language : 3.2 Data Types : 3.2.5 Boolean Type

Advanced Server provides the standard SQL type BOOLEAN. BOOLEAN can have one of only two states: TRUE or FALSE. A third state, UNKNOWN, is represented by the SQL NULL value.
The valid literal value for representing the true state is TRUE. The valid literal for representing the false state is FALSE.

3 The SQL Language : 3.2 Data Types : 3.2.5 Boolean Type

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