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The syntax for the BETWEEN search condition is as follows:
expr [ NOT ] BETWEEN start-expr AND end-expr
The BETWEEN search condition can evaluate as TRUE, FALSE, or UNKNOWN. Without the NOT keyword, the search condition evaluates as TRUE if expr is between start-expr and end-expr. The NOT keyword reverses the meaning of the search condition but leaves UNKNOWN unchanged.
The BETWEEN search condition is equivalent to a combination of two inequalities:
[ NOT ] ( expr >= start-expr AND expr <= end-expr )