我有两个表:
供应商:
+-------+------+---------------+
| supid | prid | supplier_name |
+-------+------+---------------+
| 2 | 2 | Supplier 1 |
| 3 | 2 | Supplier 2 |
| 4 | 2 | Supplier 3 |
+-------+------+---------------+
Supplier_items:
+-----------+------+-------+--------+------------+
| supitemid | prid | supid | itemid | prod_tcost |
+-----------+------+-------+--------+------------+
| 3 | 2 | 2 | 3 | 6200 |
| 4 | 2 | 2 | 4 | 810 |
| 5 | 2 | 3 | 3 | 5900 |
| 6 | 2 | 3 | 4 | 807 |
| 7 | 2 | 4 | 3 | 6680 |
| 8 | 2 | 4 | 4 | 825 |
+-----------+------+-------+--------+------------+
请帮助我获得此结果,以从Suppliers中获取带有provider_name的最小值: (其中prid = 2,按itemid分组)
+--------+---------------+----------------+
| itemid | supplier_name | min(prod_tcost) |
+--------+---------------+----------------+
| 3 | Supplier 2 | 5900 |
| 4 | Supplier 2 | 807 |
+--------+---------------+----------------+
答案 0 :(得分:0)
您可以加入并聚合:
select si.item_id, s.supplier_name, min(si.prod_tcost) min_prod_tcost
from supplier_items si
inner join suppliers s on s.supid = si.supid
where si.item_id in (3, 4) and si.prid = 2
group by si.item_id, s.supid, s.supplier_name