原文:查詢有某個字段重復的數據

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2019-09-22 12:06 0 357 推薦指數:

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sql查詢某個字段重復數據

select * from N041_湖北省房縣人民醫院 where bah in (select bah from N041_湖北省房縣人民醫院 group by bah having count( ...

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MySQL查詢表中某個字段重復數據

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MySQL查詢表中某個字段重復數據

1. 查詢SQL表中某個字段重復數據 HAVING是分組(GROUP BY)后的篩選條件,分組后的數據組內再篩選;WHERE 則是在分組前篩選。 WHERE 子句中不能使用聚集函數,而 HAVING 子句中可以,所以在集合函數中加上了 HAVING ...

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oracle刪除某個字段重復數據

Oracle 刪除重復數據只留一條 查詢及刪除重復記錄的SQL語句 1、查找表中多余的重復記錄,重復記錄是根據單個字段(Id)來判斷 select * from 表 where Id in (select Id from 表 group byId having count(Id) > ...

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怎么用mysql刪除某個字段重復數據

怎么用mysql刪除某個字段重復數據 delete from tablename where id not in (select id from (select min(id) as id from tablename group by key) as b); delete from ...

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