Question : Oracle 9i SQL decode

Hi,

I am trying write a SQL based on the following condition:

select
a.id,
a.col2 f_name,
b.col3 L-name,
c.v_date date_1,
decode(a.cat,'007','first','008','second','') as cat_type
.....
from a,b,c,...
where
......

The change I want to do on the above SQL is:

If the above SQL returns just one record for "first" and one for "second", I want to display only the record containing "first", this I can get by using MIN function in the decode, that is:
min(decode(a.cat,'007','first','008','second','')) as cat_type, I will get just the record containing "first".
But, If  it returns, more than one record for the "first" or "second" then it should return as it is.
For eg:
ID F_Name L_Name  cat_type    date_1
1   john       smith      first           02/01/2010
1   john       smith      first            14/04/2010
1   john       smith      second       05/03/2010
2 ...............................
...............................
...............................
or

ID F_Name L_Name  cat_type    date_1
1   john       smith      first             02/14/2010
1   john       smith      second          04/16/2010
1   john       smith      second          02/19/2010
...............................
...............................
 or

ID F_Name L_Name  cat_type    date_1
1   john       smith      first                02/17/2010
1   john       smith      first                 01/19/2010
1   john       smith      second            03/20/2010
1   john       smith      second               02/28/2010
..............................................................
...............................

so on so forth..

I want to do something like:

(CASE WHEN ((a.cat = '007' AND COUNT(a.cat) > 1)
           OR (a.cat = '008' AND COUNT(a.cat) > 1) ) THEN
           decode(a.cat,'007','first','008','second','')
      ELSE min(decode(a.cat,'007','first','008','second','') )
      END
   ) as cat_type

But this is not working properly..
Can somebody suggest a method to solve this?

Thanks@

Related Solutions: Oracle SQL -- WHERE NOT CLAUSE

Answer : Oracle 9i SQL decode

to make it even more simple, all you need is the below i think. It produces same results as shown in the screenshat which i already attached.. we do not need addition group by etc..

Try this and choose which ever you want.

select *
from (
          SELECT X.*,
          COUNT(DECODE(X.C_TYPE, 'PRIMARY', 1, null)) OVER (PARTITION BY X.ID) PRIM_CNT,
          COUNT(DECODE(X.C_TYPE, 'INITIAL', 1, null)) OVER (PARTITION BY X.ID) INIT_CNT
                          FROM
                                (SELECT T1.ID, T1.NAME, T1.DESCRP, t2.c_desc,
                                decode(T2.C_ID,'007','PRIMARY','008','INITIAL','') as C_TYPE
                                FROM TEST T1, TEST2 T2
                                WHERE
                                T1.ID = T2.ID
                                ) X
          group by x.ID, x.NAME, x.DESCRP, x.c_desc, x.C_TYPE ) A
where not ( a.prim_cnt =1 and a.init_cnt = 1 and c_type='PRIMARY' )

Thanks