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mysql 查詢數據資料是否有重複

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Mark ChangMark Chang
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mysql 查詢數據資料是否有重複
有沒有試過資料庫裡上萬筆資料卻不知道是不是有重複的數據?

這時你一定要試試這個查詢方法~

//列出是否有重複的姓名
select name,count(*) as count from member_table group by name having count >1
//上列查詢是說要查詢member_table的表單裡有沒有name相同的數量是大於1的

 

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Mark Chang

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