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 * fromwhere Id in (select Id fromgroup byId having count(Id) > 1)

2、刪除表中多余的重復記錄,重復記錄是根據單個字段(Id)來判斷,只留有rowid最小的記錄

DELETE fromWHERE (id) IN ( SELECT id FROMGROUP BY id HAVING COUNT(id) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROMGROUP BY id HAVING COUNT(*) > 1);

3、查找表中多余的重復記錄(多個字段)

select * from 表 a where (a.Id,a.seq) in(select Id,seq fromgroup by Id,seq having count(*) > 1)

4、刪除表中多余的重復記錄(多個字段),只留有rowid最小的記錄

delete from 表 a where (a.Id,a.seq) in (select Id,seq fromgroup by Id,seq having count(*) > 1) and rowid not in (select min(rowid) fromgroup by Id,seq having count(*)>1)

5、查找表中多余的重復記錄(多個字段),不包含rowid最小的記錄

select * from 表 a where (a.Id,a.seq) in (select Id,seq fromgroup by Id,seq having count(*) > 1) and rowid not in (select min(rowid) fromgroup by Id,seq having count(*)>1)

 


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