用一个表字段值更新另一个表字段值
类型一：Oracle:另一个表的字段更新该表字段例一、update chgtab set ( chgtab.bm, chgtab.ks ) = ( select cl.pk_doc, cl.pk_cumdoc from alterprovider cl where chgtab.fb_oid = cl.oid ) where ( chgtab.fb_oid ) in ( select cl.oid
