SQL> create table tbl(bh int,MC nvarchar2(30),sl int,dcrq nvarchar2(10));

Table created

SQL> 
SQL> insert into tbl select 141,N'AA',10,'2007-2-1' from dual;

1 row inserted

SQL> insert into tbl select 142,N'BB',44,'2007-2-1' from dual;

1 row inserted

SQL> insert into tbl select 143,N'CC',2,'2007-2-1' from dual;

1 row inserted

SQL> insert into tbl select 144,N'DD',30,'2007-2-1' from dual;

1 row inserted

SQL> insert into tbl select 145,N'EE',3,'2007-2-1' from dual;

1 row inserted

SQL> insert into tbl select 146,N'AA',6,'2007-2-1' from dual;

1 row inserted

SQL> 
SQL> select bh,mc,slnew,dcrq from (
  2    select bh,mc,slnew,dcrq,row_number()over(partition by mc,dcrq order by slnew desc) rw from (
  3      select bh,mc,sl,dcrq,sum(sl)over(partition by mc,dcrq order by bh) SLnew from tbl
  4    )
  5  ) where rw=1;

                                     BH MC                                                                SLNEW DCRQ
--------------------------------------- ------------------------ ---------- --------------------
                                    146 AA                                                                   16 2007-2-1
                                    142 BB                                                                   44 2007-2-1
                                    143 CC                                                                    2 2007-2-1
                                    144 DD                                                                   30 2007-2-1
                                    145 EE                                                                    3 2007-2-1

SQL>