sql加入查询

Question

我有一个查询

SELECT foodjoint_id FROM provider_food_joints WHERE foodjoint_name='".$foodjoint_name."'";

现在，我必须从另一个包含foodjoint_id字段的表中选择所有信息

SELECT *  AND foodjoint_name FROM  provider_food_joints  from menu_item where foodjoint_id = THOSE ID

我必须加入这两个

Answer 1

SELECT provider_food_joints.*, 
       menu_item.* 
FROM   provider_food_joints 
       INNER JOIN menu_item 
               ON menu_item.foodjoint_id = provider_food_joints.foodjoint_id 
WHERE  provider_food_joints.foodjoint_name = '".$foodjoint_name."' 

Answer 2

SELECT * FROM  provider_food_joints a join menu_item b 
on a.foodjoint_id = b.foodjoint_id where foodjoint_name='".$foodjoint_name."'"

Answer 3

SELECT *  AND foodjoint_name FROM  provider_food_joints  
WHERE foodjoint_id IN (SELECT foodjoint_id FROM provider_food_joints WHERE foodjoint_name='".$foodjoint_name."'")