SQLServer获取重复数据的方法
SQL Server获取重复数据的方法
one获取重复数据值
select user _ name from users
group by user _ name
having(count(1)> 1)
two获取重复数据记录
select * from users where user _ name in
(
select user _ name from users
group by user _ name
having(count(1)> 1)
)
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