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【MySQL】去重

时间:2017-08-29 12:17:35      阅读:245      评论:0      收藏:0      [点我收藏+]
DELETE FROM xxx WHERE id NOT in(
SELECT tmp.id FROM(SELECT id,COUNT(id) AS cnt FROM xxx GROUP BY ticket_id,ota_id HAVING cnt>1)tmp
UNION ALL 
SELECT tmp2.id FROM (SELECT id,COUNT(id) AS cnt FROM xxx GROUP BY ticket_id,ota_id HAVING cnt=1)tmp2)

 

【MySQL】去重

原文:http://www.cnblogs.com/flydkPocketMagic/p/7447119.html

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