Have:
| ID | flag |
|---|---|
| 1 | r |
| 1 | a |
| 2 | |
| 2 | |
| 3 | a |
| 3 | |
| 4 | r |
| 4 | |
| 5 | r |
| 5 | |
| 6 | r |
| 6 | a |
Want:
| Combination | Count |
|---|---|
| a-r | 2 |
| r | 2 |
| a | 1 |
| None | 1 |
Last active
February 28, 2017 21:20
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