| **Built-in/system security & identity functions** | Some Transact-SQL security functions and operators: `CURRENT_USER`, `HAS_DBACCESS`, `IS_MEMBER`, `IS_ROLEMEMBER`, `SESSION_USER`, `SUSER_NAME`, `SUSER_SNAME`, `SYSTEM_USER`, `USER`, `USER_NAME`, `EXECUTE AS`, `OPEN/CLOSE MASTER KEY` | Some Transact-SQL security functions and operators are supported: `CURRENT_USER`, `HAS_DBACCESS`, `HAS_PERMS_BY_NAME`, `IS_MEMBER`, `IS_ROLEMEMBER`, `IS_SRVROLEMEMBER`, `SESSION_USER`, `SESSION_CONTEXT`, `SUSER_NAME`, `SUSER_SNAME`, `SYSTEM_USER`, `USER`, `USER_NAME`, `EXECUTE AS`, and `REVERT`. Security functions cannot be used to query external data (store the result in variable that can be used in the query). |
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