我的表设置如下:
Fruits: ID | Name ---+----- 1 | Apple 2 | Orange 3 | Banana 4 | Lemon
和
Groups ID | Name | Fruit1 | Fruit2 | Fruit3 ---+------+--------+--------+------- 1 | A | 1 | 2 | 3 2 | B | 1 | 3 | NULL 3 | C | 4 | NULL | NULL
我想要的是从群组中选择并获取水果名称而不是其ID:
ID | Name | Fruit1 | Fruit2 | Fruit3 ---+------+--------+--------+------- 1 | A | Apple | Orange | Banana 2 | B | Apple | Banana | NULL 3 | C | Lemon | NULL | NULL
可以这样做吗?
提前致谢。
答案 0 :(得分:1)
试试这个
SELECT
G.ID,
G.Name ,
(SELECT Name FROM Fruits WHERE ID=G.Fruit1) AS Fruit1,
(SELECT Name FROM Fruits WHERE ID=G.Fruit2) AS Fruit2 ,
(SELECT Name FROM Fruits WHERE ID=G.Fruit3) AS Fruit3
FROM
Groups G