| Command | Purpose | |---------|---------| | SELECT ORIGINAL_LOGIN(), SUSER_SNAME(); | Shows the login under which the current session runs. | | EXEC sp_helpuser; | Lists users and their permissions in the current DB. | | EXEC sp_change_users_login 'Auto_Fix', 'login_name', NULL, 'password'; | Fixes orphaned users (rare, but can cause 927). | | ALTER DATABASE <db> SET SINGLE_USER WITH ROLLBACK IMMEDIATE; | Switches DB to single‑user (useful for troubleshooting). | | ALTER DATABASE <db> SET MULTI_USER; | Returns DB to normal mode. |
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[Source Systems] → [Staging Layer] → [Validation & Business Rules] → [Dimensional Modeling] → [Data Warehouse] → [BI / Analytics] | Command | Purpose | |---------|---------| | SELECT