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Which one of the following queries will select the number of unique departments ...
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Which one of the following queries will select the number of unique departments from the Department table below?
| DepartmentNumber | EmployeeNumber |
| 11 | 3244 |
| 11 | 4442 |
| 12 | 1253 |
| 11 | 5003 |
| 13 | 1123 |
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