mysql - 根据列值和非重复列选择行

Question

我想根据店铺数量选择店铺位置不同的行，示例如下:

id   | item_name   | number_of_store| store_location|
+----+---------+-------------------+-------------+
|  3 | margarine | 2              | QLD         |
|  4 | margarine | 2              | NSW         |
|  5 | wine      | 3              | QLD         |
|  6 | wine      | 3              | NSW         |
|  7 | wine      | 3              | NSW         |
|  8 | laptop    | 1              | QLD         |
+----+---------+-------------------+-------------+

想要的结果如下图所示:

id   | item_name   | number_of_store| store_location|
+----+---------+-------------------+-------------+
|  3 | margarine | 2              | QLD         |
|  4 | margarine | 2              | NSW         |
|  5 | wine      | 3              | QLD         |
|  6 | wine      | 3              | NSW         |
|  8 | laptop    | 1              | QLD         |
+----+---------+-------------------+-------------+

我不关心返回哪个 id 列值。所需的 SQL 是什么？

Answer 1

您可以使用GROUP BY:

SELECT id, item_name ,number_of_store, store_location
FROM tab
GROUP BY  item_name ,number_of_store, store_location;
-- will work if ONLY_FULL_GROUP_BY is disabled

否则你需要ANY_VALUE或类似 MIN 的聚合函数:

SELECT ANY_VALUE(id) AS id, item_name ,number_of_store, store_location
FROM tab
GROUP BY  item_name ,number_of_store, store_location;

DB-Fiddle.com Demo