oracle 中删除重复数据

//删除重复数据

delete

from MT_PL_MATERIALCONFIG

where mt_pl_materialconfig_id in

(select mt_pl_materialconfig_id

from (select max(a.mt_pl_materialconfig_id) as mt_pl_materialconfig_id,

a.ys_materialid,

a.leafblendno

from MT_PL_MATERIALCONFIG a

join (select g.ys_materialid, g.leafblendno

from MT_PL_MATERIALCONFIG g

group by g.ys_materialid, g.leafblendno

having count(*) > 1) b on a.ys_materialid =

b.YS_MATERIALID

and a.leafblendno =

b.leafblendno

group by a.ys_materialid, a.leafblendno) x)

依据分组条件来删除