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    These operators can be used in joining two seperate where clauses, $a and $b

    Example Name Result
    array('$a', 'and', '$b') AND TRUE if both $a and $b are TRUE
    array('$a', 'or', '$b') OR TRUE if either $a or $b is TRUE
    array('$a', 'xor', '$b') XOR TRUE if either $a or $b is TRUE, but not both.


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