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Comparison Functions

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    Comparison functions determine the greatest or least value from a set of values.

    GREATEST(expression1, expression2, ...)

    Largest non-NULL, non-MISSING value if the values are of the same type; otherwise NULL.

    LEAST(expression1, expression2, ...)

    Returns smallest non-NULL, non-MISSING value if the values are of the same type, otherwise returns NULL.