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Applies to: 
SQL Server
Azure SQL Managed Instance
The following functions return information that is useful in managing security. Additional functions are listed under Cryptographic Functions (Transact-SQL).
For information about membership in Windows groups, see xp_logininfo (Transact-SQL) and xp_enumgroups (Transact-SQL).
See Also
Security Stored Procedures (Transact-SQL)
Cryptographic Functions (Transact-SQL)
Built-in Functions (Transact-SQL)
Security Statements