Question

引用外部列正在处理的subquerys是否有限制？

我尝试了这个查询：

SELECT
    `userouter`.`id` AS `user_id`
FROM
    `users` AS `userouter`
WHERE
    123456 = (
        SELECT
            SUM(`tmp`.`sum`) AS `sum_total`
        FROM
            (
                SELECT
                    SUM(`invoiceposition`.`number` * `invoiceposition`.`amount`) AS `sum`
                FROM
                    `invoices` AS `invoice` INNER JOIN
                    `invoicepositions` AS `invoiceposition` ON
                        `invoice`.`id` = `invoiceposition`.`invoice`
                WHERE
                    `invoice`.`user` = `userouter`.`id`
                GROUP BY
                    `invoice`.`id`
            ) AS `tmp`
    )
GROUP BY
    `userouter`.`id`

我得到Error Code: 1054. Unknown column 'userouter.id' in 'where clause'

如何在子查询中引用userouter.id？

Answer 1

由于看起来似乎无法解决问题（双嵌套子查询引用外部查询），我现在通过创建一个用户id为参数的mysql函数来解决问题。

希望这会有助于其他搜索者

Answer 2

删除双重嵌套。

SELECT
    `userouter`.`id` AS `user_id`
FROM
    `users` AS `userouter`
LEFT JOIN (
                SELECT
                    `invoice`.`user` as `user_id`, SUM(`invoiceposition`.`number` * `invoiceposition`.`amount`) AS `sum`
                FROM
                    `invoices` AS `invoice` INNER JOIN
                    `invoicepositions` AS `invoiceposition` ON
                        `invoice`.`id` = `invoiceposition`.`invoice`
                WHERE
                    `invoice`.`user` = `userouter`.`id`
                GROUP BY
                    `invoice`.`id`
            ) AS `tmp`
ON `tmp`.`user_id` = `userouter`.`id`
WHERE
    123456 = `userouter`.`id`
GROUP BY
    `userouter`.`id`

父查询的第二个子查询引用：未找到列

2 个答案: