从MySql中的子查询中获取多行

Question

我正在尝试执行此查询

SELECT R1.`report_date`,(SELECT R2.`report_id` FROM `reports` AS R2 WHERE R2.`report_date` = R1.`report_date`) AS DATA FROM `reports` AS R1 GROUP BY R1.`report_date`

我收到此错误

MySQL said: 

#1242 - Subquery returns more than 1 row 

如何从该查询中获取多行？

Answer 1

我认为这些SQL对您有用。

SELECT R1.`report_date`,R2.`report_id` AS DATA
FROM `reports` AS R1 ,`reports` AS R2
WHERE R2.`report_date` = R1.`report_date`
GROUP BY R1.`report_date`

你可以尝试这些SQL吗

 SELECT R1.`report_date`,R2.`report_id` AS DATA
    FROM `reports` AS R1 ,`reports` AS R2
    WHERE R2.`report_date` = R1.`report_date`
    GROUP BY R2.`report_id`, R1.`report_date`

谢谢。