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mysql GROUP BY删除查询重复记录
时间：2022-06-29 08:07:50 编辑：袖梨 来源：一聚教程网
我们先来看查询重复记录
| 代码如下 | 复制代码 |
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SELECT * |
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删除的话也很简单的了
| 代码如下 | 复制代码 |
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delete from people where peopleid in (select peopleid from people group by peopleid having count (peopleid) > 1) and rowid not in (select min(rowid) from people group by peopleid having count (peopleid )>1) |
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例
id name
1 a
2 b
3 c
4 c
5 b
完整语句放出:
| 代码如下 | 复制代码 |
|
select *, count(distinct name) from table group by name 结果: id name count(distinct name) |
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原来还有更简单的办法啊。