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Functions Description

Functions for use in the SELECT and WHERE clause

A SELECT or WHERE statement of a SQL command can include any expression that uses the functions described in this section.

An expression that contains a NULL operand always returns NULL as a result, if nothing else is specified in the description of the operator or function.

General operators and functions.

( … ) parenthesis

Allows you to change the order of calculation.

SELECT 2 + 3 * 4
=> 14
SELECT (2 + 3) * 4
=> 20