functions-and-operators-overview.md

title	summary	aliases
Function and Operator Reference	Learn how to use the functions and operators.	/docs/dev/functions-and-operators/functions-and-operators-overview/ /docs/dev/reference/sql/functions-and-operators/reference/

Function and Operator Reference

The usage of the functions and operators in TiDB is similar to MySQL. See Functions and Operators in MySQL.

In SQL statements, expressions can be used on the ORDER BY and HAVING clauses of the SELECT statement, the WHERE clause of SELECT/DELETE/UPDATE statements, and SET statements.

You can write expressions using literals, column names, NULL, built-in functions, operators, and so on.

• For expressions that TiDB supports pushing down to TiKV, see List of expressions for pushdown.
• For expressions that TiDB supports pushing down to TiFlash, see Push-down expressions.