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) > 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 from 表 WHERE (id) IN ( SELECT id FROM 表 GROUP BY id HAVING COUNT(id) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM 表 GROUP 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 from 表 group 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 from 表 group by Id,seq having count(*) > 1) and rowid not in (select min(rowid) from 表 group 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 from 表 group by Id,seq having count(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,seq having count(*)>1)
