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IS_MEMBER (Transact-SQL)

Indicates whether the current user is a member of the specified Microsoft Windows group or SQL Server database role.

Topic link icon Transact-SQL Syntax Conventions


IS_MEMBER ( { 'group' | 'role' } )

'group'

Is the name of the Windows group that is being checked; must be in the format Domain\Group. group is sysname.

'role'

Is the name of the SQL Server role that is being checked. role is sysname and can include the database fixed roles or user-defined roles, but not server roles.

IS_MEMBER returns the following values.

Return value

Description

0

Current user is not a member of group or role.

1

Current user is a member of group or role.

NULL

Either group or role is not valid. When queried by a SQL Server login or a login using an application role, returns NULL for a Windows group.

IS_MEMBER determines Windows group membership by examining an access token that is created by Windows. The access token does not reflect changes in group membership that are made after a user connects to an instance of SQL Server. Windows group membership cannot be queried by a SQL Server login or a SQL Server application role.

This function evaluates role membership, not the underlying permission. For example, the db_owner fixed database role has the CONTROL DATABASE permission. If the user has the CONTROL DATABASE permission but is not a member of the role, this function will correctly report that the user is not a member of the db_owner role, even though the user has the same permissions.

The following example checks whether the current user is a member of a database role or a Windows domain group.

-- Test membership in db_owner and print appropriate message.
IF IS_MEMBER ('db_owner') = 1
   PRINT 'Current user is a member of the db_owner role'
ELSE IF IS_MEMBER ('db_owner') = 0
   PRINT 'Current user is NOT a member of the db_owner role'
ELSE IF IS_MEMBER ('db_owner') IS NULL
   PRINT 'ERROR: Invalid group / role specified'
GO

-- Execute SELECT if user is a member of ADVWORKS\Shipping.
IF IS_MEMBER ('ADVWORKS\Shipping') = 1
   SELECT 'User ' + USER + ' is a member of ADVWORKS\Shipping.' 
GO

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