DB2 merge更新多字段数据

merge into yyglbxq.curr a
        using (select khh, mdlhh from cdktj.cktj where mdlhh = 'jt1' or mdlhh = 'JT1' or mdlhh = 'jt4' or mdlhh = 'JT4') b
        on a.core_cust_id = b.khh
        when matched then
                update set a.belg_org_id = b.mdlhh
        else
                ignore;