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问题描述
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我有两个表:DISH 和 DISH_HAS_DISHES.Dish 表包含所有菜肴，Dish_has_dishes"表与Dish"表是一对多的关系.IE.一道菜可以有多道菜.例如
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
菜:
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meal_id和dish_id都是DISH表中的ID.现在我想要这样的格式:
Here meal_id and dish_id both are IDs from DISH table. Now I want a format like this:
meal_id dish_ids dish_names
1 2,3,4 dish_2, dish_3, dish_4
那是每顿饭用逗号分隔的菜名和菜名.怎么做?
That is comma separated dish id and names for each meal. How to do that?
推荐答案
使用 GROUP_CONCAT FUNCTION
Use 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
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