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例子1：查找一个表中的重复数据，重复记录是根据单个字段（Id）来判断，表名为STUDENT
SELECT ID ,
COUNT(1) FROM STUDENT T GROUP BY T.ID HAVING COUNT(ID) > 1
例子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，表名为STUDENT
DELETE FROM STUDENT WHERE ID IN (SELECT ID FROM STUDENT T GROUP BY T.ID HAVING COUNT(ID) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM STUDENT T GROUP BY T.ID HAVING COUNT(T.ID) > 1)
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原文地址：http://www.cnblogs.com/qadyyj/p/5737796.html
