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I need just the count of unique phone numbers in my mySql table. How do I do that?
| Author | Votes | Δ |
|---|---|---|
| Shyam Natraj Kanagasabapathy | 4 | +3.55 |
| Bjoern | 2 | -3.55 |
Last visited: Sep 14, 2014, 5:07:29 AM