The dept_manager table has records about Employee acting as manager for a given department. More details are in this table:
| Table Column | Dataype | Description |
| emp_no | INT | Employee ID who is acting as manager for this department |
| dept_no | STRING | Department ID |
| from_date | DATE | Starting date from which Employee is acting as Manager for this department. |
| to_date | DATE | Ending date till where the Employee has acted as Manager for this department. |
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