其他数据还是按排序取,只有指定字段获取到最大值

SELECT id, max(operat_time) FROM tb GROUP BY id;

其他数据还是按排序取,只有指定字段获取到最小值

SELECT id, min(operat_time) FROM tb GROUP BY id;

 

按操作用户uid分组查最新一条操作记录

select * from (select * from tb order by operat_time desc) as a group by a.uid

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