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mysql子查询时group by不是取的第一条数据

2020-04-28 00:38 ⁄ 被浏览 4979

子查询时group by不是取的第一条数据，mysql版本为5.7，在5.5中没问题。

查询语句如下：

SELECT * FROM (SELECT id,uid FROM photo WHERE uid IN (4655,6282) AND ispass=1 ORDER BY id DESC) AS tt GROUP BY uid;

结果：

改为（需要加入limit限制）：

SELECT * FROM (SELECT id,uid FROM photo WHERE uid IN (4655,6282) AND ispass=1 ORDER BY id DESC LIMIT 100000) AS tt GROUP BY uid;

结果：