Php 如何在GROUPBY语句中使用ORDERBY子句

我有两张表

tbl\u发行日志，tbl\u杂志发行

tbl_issue_log
============

+----------+--------+--------+-----------+---------------------+
| issue_id | mag_id | log_id | operation |    updated_time     |
+----------+--------+--------+-----------+---------------------+
| 2        | 1      | 1      | 1         | 2014-01-30 21:29:44 |
| 3        | 4      | 1      | 1         | 2015-01-30 21:29:44 |
| 2        | 1      | 1      | 3         | 2015-01-31 21:29:44 |
+----------+--------+--------+-----------+---------------------+

在tbl_问题日志中，包含同一问题id的多条记录。我一次只想要一个问题 这必须是最新的更新时间

我的问题是

SELECT 
    `tbl_issue_log`.`operation`,
    `tbl_magazine_issue`.`ISSUE_ID`,
    `tbl_magazine_issue`.`ISSUE_NAME`,
    `tbl_magazine_issue`.`MAGAZINE_ID`,
    `tbl_magazine_issue`.`COVER_PAGE_THUMB`,
    `tbl_magazine_issue`.`FROM_DATE`,
    `tbl_magazine_issue`.`TO_DATE`,
    `tbl_magazine_issue`.`issue_description`,
    `tbl_magazine_issue`.`login_page_no`
FROM
    `tbl_issue_log`
        LEFT JOIN
    `tbl_magazine_issue` ON tbl_magazine_issue.ISSUE_ID = tbl_issue_log.issue_id


WHERE
    (tbl_issue_log.mag_id = '1')
        AND (tbl_magazine_issue.ISSUE_STATUS = 3)
        AND (tbl_issue_log.updated_time > '2014-02-25 00:42:22')
GROUP BY tbl_issue_log.issue_id
ORDER BY tbl_issue_log updated_time DESC;

这里我得到了基于问题id的输出。但没有得到最新更新的计时记录

---

如果有人知道这件事，请帮助我

你能试着把ORDERBY子句改为

ORDER BY tbl_issue_log.updated_time  DESC;

编辑--- 当您根据问题id进行分组时，mysql将选择与问题id匹配的第一行。order by稍后运行，它基本上不会返回您要查找的内容。为此，您可能需要使用子查询方法

select some_table.* FROM 
(
SELECT 
    MAX(tbl_issue_log.updated_time) AS updated_time,
    `tbl_issue_log`.`operation`,
    `tbl_magazine_issue`.`ISSUE_ID`,
    `tbl_magazine_issue`.`ISSUE_NAME`,
    `tbl_magazine_issue`.`MAGAZINE_ID`,
    `tbl_magazine_issue`.`COVER_PAGE_THUMB`,
    `tbl_magazine_issue`.`FROM_DATE`,
    `tbl_magazine_issue`.`TO_DATE`,
    `tbl_magazine_issue`.`issue_description`,
    `tbl_magazine_issue`.`login_page_no`
FROM
    `tbl_issue_log`
        LEFT JOIN
    `tbl_magazine_issue` ON tbl_magazine_issue.ISSUE_ID = tbl_issue_log.issue_id


WHERE
    (tbl_issue_log.mag_id = '1')
        AND (tbl_magazine_issue.ISSUE_STATUS = 3)
        AND (tbl_issue_log.updated_time > '2014-02-25 00:42:22')
GROUP BY tbl_issue_log.issue_id
) some_table
ORDER BY some_table.updated_time DESC;

试试这个

SELECT * FROM
(SELECT 
`tbl_issue_log`.`operation`,
`tbl_magazine_issue`.`ISSUE_ID`,
`tbl_magazine_issue`.`ISSUE_NAME`,
`tbl_magazine_issue`.`MAGAZINE_ID`,
`tbl_magazine_issue`.`COVER_PAGE_THUMB`,
`tbl_magazine_issue`.`FROM_DATE`,
`tbl_magazine_issue`.`TO_DATE`,
`tbl_magazine_issue`.`issue_description`,
`tbl_magazine_issue`.`login_page_no`
FROM
`tbl_issue_log`
    LEFT JOIN
`tbl_magazine_issue` ON tbl_magazine_issue.ISSUE_ID = tbl_issue_log.issue_id
WHERE
(tbl_issue_log.mag_id = '1')
    AND (tbl_magazine_issue.ISSUE_STATUS = 3)
    AND (tbl_issue_log.updated_time > '2014-02-25 00:42:22')
ORDER BY tbl_issue_log.updated_time DESC ) TEMP_TABLE
GROUP BY ISSUE_ID

---

谢谢，那是个抄袭错误。我获得了输出，但无法获取最新更新的问题详细信息。

SELECT * FROM
(SELECT 
`tbl_issue_log`.`operation`,
`tbl_magazine_issue`.`ISSUE_ID`,
`tbl_magazine_issue`.`ISSUE_NAME`,
`tbl_magazine_issue`.`MAGAZINE_ID`,
`tbl_magazine_issue`.`COVER_PAGE_THUMB`,
`tbl_magazine_issue`.`FROM_DATE`,
`tbl_magazine_issue`.`TO_DATE`,
`tbl_magazine_issue`.`issue_description`,
`tbl_magazine_issue`.`login_page_no`
FROM
`tbl_issue_log`
    LEFT JOIN
`tbl_magazine_issue` ON tbl_magazine_issue.ISSUE_ID = tbl_issue_log.issue_id
WHERE
(tbl_issue_log.mag_id = '1')
    AND (tbl_magazine_issue.ISSUE_STATUS = 3)
    AND (tbl_issue_log.updated_time > '2014-02-25 00:42:22')
ORDER BY tbl_issue_log.updated_time DESC ) TEMP_TABLE
GROUP BY ISSUE_ID