oracle數據庫表中某幾個字段的重複數據去重

delete from szpj_biz_水文觀測數據 a where (a.觀測點_id, a.觀測時間, a.取樣位置) in (select 觀測點_id, 觀測時間, 取樣位置 from szpj_biz_水文觀測數據 group by 觀測點_id, 觀測時間, 取樣位置 having count(*) > 1) and rowid not in (select min(rowid) f

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