MySQL:多行作为逗号分隔的单行

I have two tables : DISH and DISH_HAS_DISHES. Dish table has all the dishes and "Dish_has_dishes" table has a one-to-many relationship with "Dish" table. I.e. a dish can have multiple dishes. For example

我有两张桌子:盘子和盘子。Dish table有所有的Dish，“Dish_has_dishes”这个table和“Dish”这个table有一对多的关系。也就是说，一道菜可以有好几道菜。例如

DISH :

菜:

dish_id   dish_name
1         dish_1
2         dish_2
3         dish_3
4         dish_4

DISH_HAS_DISHES :

DISH_HAS_DISHES:

meal_id   dish_id
1         2
1         3
1         4

Here meal_id and dish_id both are IDs from DISH table. Now I want a format like this:

在这里，meal_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

That is comma separated dish id and names for each meal. How to do that?

这是用逗号分隔的菜名和每顿饭的名字。如何做呢?

1 个解决方案

#1

Use GROUP_CONCAT FUNCTION

使用GROUP_CONCAT函数

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

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