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    Logic Functions

    Last updated: 2023-11-08 14:20:13
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    Logical functions are used to perform logical operations, and the result is a Boolean value.
    Three logical statuses are available: TRUE, FALSE, and UNKNOWN (represented by NULL). Therefore, NOT TRUE is not necessarily FALSE; it can also be UNKNOWN.
    Function
    Description
    boolean1 OR boolean2
    Returns TRUE if boolean1 or boolean2 is TRUE.
    boolean1 AND boolean2
    Returns TRUE if boolean1 and boolean2 are both TRUE.
    NOT boolean
    Returns TRUE if boolean is FALSE; returns FALSE if boolean is TRUE; returns UNKNOWN if boolean is UNKNOWN.
    boolean IS FALSE
    Returns TRUE if boolean is FALSE; returns FALSE if boolean is UNKNOWN.
    boolean IS NOT FALSE
    Returns TRUE if boolean is not FALSE; returns TRUE if boolean is UNKNOWN.
    boolean IS UNKNOWN
    Returns TRUE if boolean is UNKNOWN; otherwise FALSE.
    boolean IS NOT UNKNOWN
    Returns TRUE if boolean is not UNKNOWN; otherwise FALSE.
    
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