SET LANGUAGE (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
SQL analytics endpoint in Microsoft Fabric
Warehouse in Microsoft Fabric
Specifies the language environment for the session. The session language determines the datetime formats and system messages.
Transact-SQL syntax conventions
Syntax
SET LANGUAGE { [ N ] 'language' | @language_var }
Arguments
[N]'language' | @language_var
The name of the language as stored in sys.syslanguages. This argument can be either Unicode or DBCS converted to Unicode. To specify a language in Unicode, use N'<language>'. If specified as a variable, the variable must be sysname.
Remarks
The setting of SET LANGUAGE is set at execute or run time and not at parse time.
SET LANGUAGE implicitly sets the setting of SET DATEFORMAT.
Permissions
Requires membership in the public role.
Examples
The following example sets the default language to Italian, displays the month name, and then switches back to us_english and displays the month name again.
DECLARE @Today DATETIME;
SET @Today = '2024-08-05';
SET LANGUAGE Italian;
SELECT DATENAME(month, @Today) AS 'Month Name';
SET LANGUAGE us_english;
SELECT DATENAME(month, @Today) AS 'Month Name';
GO