mysql - 在第三级子查询中使用列

Question

如何SELECT在第三级子查询中使用顶级列？

我试过了，但它给出了：unknown column foo.id

SELECT foo.id,
       (
           SELECT SUM(bar.amount)
           FROM bar
           JOIN (
               SELECT DISTINCT ding.id
               FROM baz
               JOIN ding ON ding.baz_id = baz.id
               WHERE baz.foo_id = foo.id
           ) AS j ON j.id = bar.id
       ) AS amount
FROM foo

Answer 1

试试 SELECT foo_id

FROM (
       SELECT SUM(bar.amount),j.foo_id
       FROM bar
       JOIN (
           SELECT DISTINCT ding.id,baz.foo_id
           FROM baz
           JOIN ding ON ding.baz_id = baz.id
       ) AS j ON j.id = bar.id
   ) AS amount;