Regexp_substr and select all

Question

HI
I have this doubt, I have a query like this:
SELECT *
FROM table
WHERE DIVISION IN (
SELECT REGEXP_SUBSTR( DIVISIONS ,'[^,]+', 1, LEVEL) FROM DUAL
CONNECT BY REGEXP_SUBSTR( DIVISIONS , '[^,]+', 1, LEVEL) IS NOT NULL )
It works fine when DIVISIONS its like "3,4,5,6"
but i want, that when DIVISION its empty ( "" ) it does not filter,
Can you help me find how can i do this?
thanks

Answer 1

How about:
SQL> var divisions varchar2(100)
SQL> exec :divisions := '3,2,6,7,8,6,34'
PL/SQL procedure successfully completed.
SQL> -- generating sample data:
SQL> with t as (
  2  select 1 div from dual union
  3  select 2 div from dual union
  4  select 3 div from dual union
  5  select 4 div from dual union
  6  select 5 div from dual union
  7  select 6 div from dual
  8  )
  9  --
10  -- actual query
11  --
12  select *
13  from   t
14  where
15    case
16      when :divisions is null then 1
17      when :divisions is not null
18      and div in ( select regexp_substr(:divisions ,'[^,]+', 1, level)
19                   from   dual
20                   connect by regexp_substr(:divisions , '[^,]+', 1, level) is not null
21                  ) then 1
22    end = 1;
       DIV
         2
         3
         6
3 rows selected.
SQL>  exec :divisions := '';
PL/SQL procedure successfully completed.
SQL> -- generating sample data:
SQL> with t as (
  2  select 1 div from dual union
  3  select 2 div from dual union
  4  select 3 div from dual union
  5  select 4 div from dual union
  6  select 5 div from dual union
  7  select 6 div from dual
  8  )
  9  --
10  -- actual query
11  --
12  select *
13  from   t
14  where
15    case
16      when :divisions is null then 1
17      when :divisions is not null
18      and div in ( select regexp_substr(:divisions ,'[^,]+', 1, level)
19                   from   dual
20                   connect by regexp_substr(:divisions , '[^,]+', 1, level) is not null
21                  ) then 1
22    end = 1;
       DIV
         1
         2
         3
         4
         5
         6
6 rows selected.