Operator precedences are shown in the following list, from highest precedence to the lowest. Operators that are shown together on a line have the same precedence.
INTERVAL BINARY, COLLATE ! - (unary minus), ~ (unary bit inversion) ^ *, /, DIV, %, MOD -, + <<, >> & | = (comparison), <=>, >=, >, <=, <, <>, !=, IS, LIKE, REGEXP, IN BETWEEN, CASE, WHEN, THEN, ELSE NOT AND, && XOR OR, || = (assignment), :=
The precedence of
= depends on whether it is
used as a comparison operator
=) or as an
used as a comparison operator, it has the same precedence as
IN. When used as an assignment
operator, it has the same precedence as
Section 13.7.4, “SET Syntax”, and
Section 9.4, “User-Defined Variables”, explain how MySQL determines
which interpretation of
= should apply.
For operators that occur at the same precedence level within an expression, evaluation proceeds left to right, with the exception that assignments evaluate right to left.
The meaning of some operators depends on the SQL mode:
The precedence of operators determines the order of evaluation of terms in an expression. To override this order and group terms explicitly, use parentheses. For example:
SELECT 1+2*3;-> 7 mysql>
SELECT (1+2)*3;-> 9