1、查找表中多余的重复记录,重复记录是根据单个字段(ID)来判断
SELECT * FROM 表 WHERE ID IN (SELECT ID FROM 表 GROUP BY ID HAVING COUNT(1) > 1);
2、删除表中多余的重复记录,重复记录是根据单个字段(ID)来判断,只留有ROWID最小的记录
DELETE FROM 表 WHERE (ID) IN ( SELECT ID FROM 表 GROUP BY ID HAVING COUNT(1) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM 表 GROUP BY ID HAVING COUNT(1) > 1);
3、查找表中多余的重复记录(多个字段)
SELECT * FROM 表 A WHERE (A.ID,A.SEQ) IN (SELECT ID,SEQ FROM 表 GROUP BY ID,SEQ HAVING COUNT(1) > 1);
4、删除表中多余的重复记录(多个字段),只留有ROWID最小的记录
DELETE FROM 表 A WHERE (A.ID,A.SEQ) IN (SELECT ID,SEQ FROM 表 GROUP BY ID,SEQ HAVING COUNT(1) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM 表 GROUP BY ID,SEQ HAVING COUNT(1)>1);
5、快速获取去重之后的数据,重复记录是根据单个字段(ID)来判断,只留有ROWID最小的记录
select * from 表 where ROWID IN (SELECT MIN(ROWID) FROM 表 GROUP BY ID HAVING COUNT(1) > 1);