LOWER()

Returns a character expression after converting uppercase character data to lowercase.

Signature

LOWER ( character_expression )

Parameters

  • character_expression — Is an expression of character or binary data. *character_expression* can be a constant, variable, or column. *character_expression* must be of a data type that is implicitly convertible to varchar. Otherwise, use CAST to explicitly convert *character_expression*.

Examples

SELECT LOWER('KEYBOARD') AS quiet;
quiet
--------
keyboard

Run against SQL Server 16.0.4265.3 on 2026-09-13. This is the output we got, not the documentation’s.

Available on

  • SQL Server 2017 and later
  • Azure SQL Database
  • Azure SQL Managed Instance
  • Azure Synapse Analytics
  • Analytics Platform System (PDW)
  • Microsoft Fabric warehouse
  • Fabric SQL database

Signature and description adapted from the Microsoft SQL documentation, used under the CC BY 4.0. SQL Server and Azure are trademarks of the Microsoft group of companies. This page is not affiliated with Microsoft.