expression [ NOT ] BETWEEN start-expression AND end-expression

The BETWEEN search condition can evaluate as TRUE, FALSE, or UNKNOWN. Without the NOT keyword, the search condition evaluates as TRUE if expression is between start-expression and end-expression. 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 ] ( expression >= start-expression AND expression <= end-expression )