select username,count(*) as count from hk_test group by username having count>1; ...
一 背景 一張person表,有id和name的兩個字段,id是唯一的不允許重復,id相同則認為是重復的記錄。 二 解決 select id from group by id having count gt 按照id分組並計數,某個id號那一組的數量超過 條則認為重復。 http: blog. .com ability money blog static http: blog. .com ane ...
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select username,count(*) as count from hk_test group by username having count>1; ...
' MySQL里查詢表里的重復數據記錄: 先查看重復的原始數據: 場景一:列 ...
先貼個簡單的SQL語句 使用詳情說明 ...
查詢某個字段存在重復數據的方法: select * from tablename where id in (select id from tablename group by id having count(id) > 1) 其中id為要查詢的重復字段名! ...
SQL重復記錄查詢方法 2008年08月14日 星期四 21:01 SQL重復記錄查詢 1、查找表中多余的重復記錄,重復記錄是根據單個字段(peopleId)來判斷select * from peoplewhere peopleId in (select ...
SQL重復記錄查詢方法 2008年08月14日 星期四 21:01 SQL重復記錄查詢 1、查找表中多余的重復記錄,重復記錄是根據單個字段(peopleId)來判斷select * from peoplewhere peopleId in (select ...
SQL重復記錄查詢 1、查找表中多余的重復記錄,重復記錄是根據單個字段(peopleId)來判斷select * from peoplewhere peopleId in (select peopleId from people group by peopleId having ...
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