Operator Precedence in MySQL
MySQL evaluates expressions with multiple operators according to a predefined precedence order. Operators with higher precedence are evaluated first, and operators with the same precedence are evaluated according to their associativity (left-to-right or right-to-left).
Arithmetic operators: *, /, % have higher precedence than +, -.
Comparison operators (e.g., =, <, >, <=, >=, <>) are evaluated after arithmetic operators.
Logical operators: NOT has higher precedence than AND, which has higher precedence than OR.
Bitwise operators are evaluated according to their defined precedence.
Parentheses
()can be used to override the default precedence order.
Unary operators: +, -, ~, !
Multiplicative: *, /, %
Additive: +, -
Bitwise shift: <<, >>
Comparison: =, <=>, <, <=, >, >=, !=, <>
Logical NOT: NOT
Logical AND: AND
Logical OR: OR
Assignment: :=, =
In summary: MySQL evaluates operators according to their precedence and associativity rules. When multiple operators appear in a single expression, use parentheses to make the evaluation order explicit and avoid unexpected results.