| Group (cost=1770.68..1771.02 rows=57 width=4) |
| Group Key: out_device |
| -> Sort (cost=1770.68..1770.85 rows=68 width=4) |
| Sort Key: out_device |
| -> Bitmap Heap Scan on tbl_punch (cost=1067.83..1768.61 rows=68 width=4) |
| Recheck Cond: (user_id = 5440) |
| Filter: (out_device IS NOT NULL) |
| -> Bitmap Index Scan on tbl_punch_pkey (cost=0.00..1067.81 rows=265 width=0) |
| Index Cond: (user_id = 5440) |