Keywords: Expressions, hierarchy of, precedence of

# Expression precedence

Precedence of operations from highest to lowest is:

- (), ?, Constant (including sign), NULL, ColumnReference, ScalarSubquery, CAST
- LENGTH, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, and other built-ins
- unary + and -
- *, /, || (concatenation)
- binary + and -
- comparisons, quantified comparisons, EXISTS, IN, IS NULL, LIKE, BETWEEN, IS
- NOT
- AND
- OR

You can explicitly specify precedence by placing expressions within parentheses. An expression within parentheses is evaluated before any operations outside the parentheses are applied to it.

#### Example

    (3+4)*9
    (age < 16 OR age > 65) AND employed = TRUE

Parent topic: SQL expressions
Related concepts
Dynamic parameters
Related reference
SelectExpression
TableExpression
VALUES expression
Boolean expressions