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

The BETWEEN condition can evaluate to TRUE, FALSE, or UNKNOWN. Without the NOT keyword, the condition evaluates as TRUE if expression is between start-expression and end-expression. The NOT keyword reverses the meaning of the condition, but leaves UNKNOWN unchanged.

The BETWEEN condition is equivalent to a combination of two inequalities:

[ NOT ] ( expression >= start-expression
                AND expression <= end-expression )

List all the products cheaper than $10 or more expensive than $15.

SELECT Name, UnitPrice
FROM Products
WHERE UnitPrice NOT BETWEEN 10 AND 15;