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皇家娱乐场及删除重复数据只保留一条数据

来源:http://www.ccidsi.com 作者:最新解决方案 人气:159 发布时间:2019-12-05
摘要:mysql——查询重复数据,及删除重复数据只保留一条数据,mysql一条 查询 text 表中,user_name字段值重复的数码及重新次数 select user_name,count(*) as count from text group by user_name having count1   除

mysql——查询重复数据,及删除重复数据只保留一条数据,mysql一条

查询 text 表中,user_name字段值重复的数码及重新次数

select user_name,count(*) as count from text 
group by user_name having count>1

 

除去 text 表中,重复现身的多寡只保留 ID 最小的一条数据,未有重新的数量不删除。

delete from text where DW_DATE=20171227 AND
 id not in( select id from (select max(id) as id,count(user_name) as count from text
WHERE DW_DATE=20171227
group by user_name having count =1 order by count desc) as tab)
AND
id not in( select id from (select max(id) as id,count(user_name) as count from text
WHERE DW_DATE=20171227
group by user_name having count >1 order by count desc) as tab)

 

查询 text 表中,user_name字段值重复的数额及重新次数 select user_name , co...

查询 text 表中,user_name字段值重复的多寡及重新次数

select user_name,count(*) as count from text 
group by user_name having count>1

 

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