oracle查询/去除重复值

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-- 查找重复值及最小的id
select	min (id), province, city, count (*) cnt
	from t 
	group by province, city
	having count (*) > 1;

-- 保留最小的重复值
delete from t  
	where id not in (
		select min(id) from t
			group by province, city
);