tony@ORCL1> create table t_pj_gdjhssl(xzq_dm varchar2(100), nf int, jh_ssl int);

Table created.

tony@ORCL1> insert into t_pj_gdjhssl values('4406', 2012, 0.8772);

1 row created.

tony@ORCL1> commit;

Commit complete.

tony@ORCL1> CREATE OR REPLACE FUNCTION PJ_GDJHSSL_SCORE (mXZQDM VARCHAR2,mNF number)
  2  RETURN int IS
  3  vSCORE int;
  4  BEGIN
  5    select
  6    case
  7    when jh_ssl>=0.8 and jh_ssl<1.2 then 8
  8    when (jh_ssl>=0.75 and jh_ssl<0.8) or (jh_ssl>=1.2 and jh_ssl<1.25) then 7
  9    when (jh_ssl>=0.7 and jh_ssl<0.75) or (jh_ssl>=1.25 and jh_ssl<1.3) then 6
 10    when (jh_ssl>=0.65 and jh_ssl<0.7) or (jh_ssl>=1.3 and jh_ssl<1.35) then 5
 11    when (jh_ssl>=0.6 and jh_ssl<0.65) or (jh_ssl>=1.35 and jh_ssl<1.4) then 4
 12    when (jh_ssl>=0.55 and jh_ssl<0.6) or (jh_ssl>=1.4 and jh_ssl<1.45) then 3
 13    when (jh_ssl>=0.5 and jh_ssl<0.55) or (jh_ssl>=1.45 and jh_ssl<1.5) then 2
 14    when (jh_ssl>=0.45 and jh_ssl<0.5) or (jh_ssl>=1.5 and jh_ssl<1.55) then 1
 15    else 0
 16    end as fz into vSCORE
 17    from t_pj_gdjhssl where XZQ_DM=mXZQDM AND nf=mNF;
 18    RETURN vSCORE;
 19  END PJ_GDJHSSL_SCORE;
 20  /

Function created.

tony@ORCL1> select PJ_GDJHSSL_SCORE('4406',2012) from t_pj_gdjhssl where xzq_dm='4406' and nf=2012;

PJ_GDJHSSL_SCORE('4406',2012)
-----------------------------
                            8

tony@ORCL1>