oracle数据库表中某几个字段的重复数据去重

delete from szpj_biz_水文观测数据 a where (a.观测点_id, a.观测时间, a.取样位置) in (select 观测点_id, 观测时间, 取样位置 from szpj_biz_水文观测数据 group by 观测点_id, 观测时间, 取样位置 having count(*) > 1) and rowid not in (select min(rowid) f

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