Question

我有以下条件：

Table : user, owner, category, user_sub_category
        inner join user.owner_id = user.id
        inner join user.category_id = category.id
        left join user.id = user_sub_category.lounge_id
        left join user_sub_category.category_id = category.id

现在我需要在sql查询中转换它们，但我不知道我做的是否正确。到目前为止我所做的是：

SELECT * FROM db.user
  inner join db.owner
  on  user.owner_id = owner.id
  inner join db.category
  on user.category_id = category.id
  left join db.user_sub_category
  on user.id = user_sub_category.lounge_id
  and user_sub_category.category_id = category.id;

请随时纠正我。感谢

Answer 1

SELECT * FROM db.user
  inner join db.owner
  on  user.owner_id = owner.id --in condition it says user.id, but if it is owner table, then this is OK
  inner join db.category
  on user.category_id = category.id
  left join db.user_sub_category
  on user.id = user_sub_category.lounge_id
  and user_sub_category.category_id = category.id;

看起来很好。

如何将此条件转换为查询

1 个答案: