一尘不染

MySQL:多行作为逗号分隔的单行

mysql

我有两个表:DISH和DISH_HAS_DISHES。Dish表包含所有菜肴,“ Dish_has_dishes”表与“
Dish”表具有一对多关系。即一个菜可以有多个菜。例如

dish_id   dish_name
1         dish_1
2         dish_2
3         dish_3
4         dish_4

DISH_HAS_DISHES

meal_id   dish_id
1         2
1         3
1         4

这里的meat_id和dish_id都是来自DISH表的ID。现在我想要这样的格式:

meal_id     dish_ids     dish_names
1           2,3,4        dish_2, dish_3, dish_4

这是用逗号分隔的菜肴ID和每餐的名称。怎么做?


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2020-05-17

共1个答案

一尘不染

使用GROUP_CONCAT FUNCTION

http://dev.mysql.com/tech-resources/articles/4.1/grab-
bag.html

 SELEct m.meal_Id, 
        GROUP_CONCAT(dish_id) dish_ids, 
        GROUP_CONCAT(dish_name) dish_names
 FROM DISH_HAS_DISHES m JOIN DISH d ON (m.dish_id = d.dish_id)
 GROUP BY meal_Id
2020-05-17