| Group (cost=2532.99..2534.67 rows=151 width=4) |
| Group Key: out_device |
| -> Sort (cost=2532.99..2533.83 rows=336 width=4) |
| Sort Key: out_device |
| -> Seq Scan on tbl_punch (cost=0.00..2518.89 rows=336 width=4) |
| Filter: ((out_device IS NOT NULL) AND (user_id = 1001)) |