mysql - SQL查询改进(表中的额外列)

Question

我有一个 SQL 查询，我知道它写得非常糟糕。你们能帮我用正常人的方式写一下吗？

谢谢。

select distinct R.*, X.LIKED
from Recipe R
left join (select distinct R.* , '1' as LIKED 
           from Recipe R, Likes L 
           where R.id = L.idRecipe 
             and L.email = 'dvader@deathstar.galacticempire') X
on R.id = X.id

Answer 1

看起来你需要所有来自带有vader@deathstar.galacempire喜欢标记的食谱

select R.*, likedR.LIKED
from Recipe R
left join (select distinct R.id , '1' as LIKED 
           from Recipe R 
                inner join Likes L on R.id = L.idRecipe
           where  
                L.email = 'dvader@deathstar.galacticempire') likedR
on R.id = likedR.id