oracle partition by 去除重複記錄（多個字段）

delete 表名 a where not exists( select b.rd from (select rowid rd,row_number()over( partition by 替重字段一，替重字段二，替重字段三 order by 替重字段一/二/三) rn from 表名) b where b.rn=1 and a.rowid = b.rd );

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