Transact-SQL Syntax ConventionsIndicates whether the current user is a member of the specified Microsoft Windows group or Microsoft SQL Server database role.
Transact-SQL Syntax Conventions
IS_MEMBER ( { 'group' | 'role' } ) ’ group ’
Applies to: SQL Server 2008 through SQL Server 2008 SQL Server 2017
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.
int
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 [!INCLUDEssNoVersion] 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 SQL Server login or a SQL Server SQL Server SQL Server application role.
To add and remove members from a database role, use ALTER ROLE (Transact-SQL). To add and remove members from a server role, use ALTER SERVER ROLE (Transact-SQL).
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.
Members of the sysadmin fixed server role enter every database as the dbo user. Checking permission for member of the sysadmin fixed server role, checks permissions for dbo, not the original login. Since dbo can’t be added to a database role and doesn’t exist in Windows groups, dbo will always return 0 (or NULL if the role doesn’t exist).
To determine whether another SQL Server login is a member of a database role, use IS_ROLEMEMBER (Transact-SQL). To determine whether a SQL Server SQL Server login is a member of a server role, use IS_SRVROLEMEMBER (Transact-SQL).
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 IS_SRVROLEMEMBER (Transact-SQL)
Principals (Database Engine)
Security Catalog Views (Transact-SQL)
Security Functions (Transact-SQL)