http://caihorse.iteye.com/blog/538432

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删除重复记录的SQL

SELECT * FROM aaa E WHERE E.ROWID > (SELECT MIN(X.ROWID) FROM aaa X WHERE X.AA = E.AA);

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DELETE FROM aaa E WHERE E.ROWID > (SELECT MIN(X.ROWID) FROM aaa X WHERE X.AA = E.AA);