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Is there any duplicate data in the table
Others
2021-01-23 18:58:40
views: null
Business scenario:
查询一张表中是重复数据;
或者统计有几个列是否存在重复。
select A from table group by A having
count
(
*
)
>
1
;
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Origin
blog.csdn.net/qq_40145879/article/details/107462378
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