Big Problem.. Need a query

Question

Hi,
I have an issue with Sql Query, i have written the same some extent.
Aim : I am trying to fetch the Numeric data from a Character column and filter with some numeric condition.
I have written the same up to filter the numeric data, the problem is how to filter data again the resultant query with numeric operations.
Problem Facing :
Invalid Number... Error....
I have prepared a Small Test Case for this scenario :
CREATE TABLE KSK_TEST_Q
(INVENTORY_ITEM_ID NUMBER,
ELEMENT_NAME VARCHAR2(2000),
ELEMENT_VALUE VARCHAR2(2000),
ITEM_CATALOG_GROUP_ID NUMBER
BEGIN
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (2794,'Memory Supplied','SATIH123',93);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (167,'Diameter','123SEFG',33);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (167,'Thread','123ASDF1234213',33);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (482,'Thread','32',33);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (484,'Diameter','6',33);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (484,'Thread','28',33);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (247,'Size','1232130.90',115);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (247,'Size','123213.WER234',113);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (247,'Size','17',31);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (225,'Size','TASDRTS',115);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (225,'Size','23423',113);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (225,'Size','5665.09',31);
Insert into KSK_TEST_Q (INVENTORY_ITEM_ID,ELEMENT_NAME,ELEMENT_VALUE,ITEM_CATALOG_GROUP_ID) values (199,'Size','89.00',115);
END;
Case 1 :
-- fine because its checking as a Character value --------------
select * from ( select * from (select cc.* ,ltrim(translate(cc.element_value,'0123456789.0123456789',' '))
res from KSK_TEST_Q cc where element_value <>'.' ) where res is null or res = '0' )
where element_value = '32'
Case 2:
-- error Invalid Error -- because it was checking for the all the data not for resultant query ……. Why its happening like this..?
select * from ( select * from (select cc.* ,ltrim(translate(cc.element_value,'0123456789.0123456789',' '))
res from KSK_TEST_Q cc where element_value <>'.' ) where res is null or res = '0' )
where element_value = 32 ;
Case 3:
-- error Invalid Error -- for the same case2 with applied to_number to value --
select * from ( select * from (select cc.* ,ltrim(translate(cc.element_value,'0123456789.0123456789',' '))
res from KSK_TEST_Q cc where element_value <>'.' ) where res is null or res = '0' )
where to_number (element_value) = 32 ;
Note: It was searching the value entire table KSK_TEST_Q, not in the resultant set... How can we handle the same on the resultant set only...
I need to develop the same with single query only ( not allowed to use procedures/blocks ), and finally I want to get the data for the filter condition (element_value) = 32 condition .
Please help on this
Thanks,
Kumar

Answer 1

Please post what do you expect to get for each element_value. Is it:
SQL> select  t.*,
  2          regexp_replace(
  3                         element_value,
  4                         '[^\+\-\.0123456789]'
  5                        ) num
  6    from  KSK_TEST_Q t
  7  /
INVENTORY_ITEM_ID ELEMENT_NAME                   ELEMENT_VALUE        ITEM_CATALOG_GROUP_ID NUM
             2794 Memory Supplied                SATIH123                                93 123
              167 Diameter                       123SEFG                                 33 123
              167 Thread                         123ASDF1234213                          33 1231234213
              482 Thread                         32                                      33 32
              484 Diameter                       6                                       33 6
              484 Thread                         28                                      33 28
              247 Size                           1232130.90                             115 1232130.90
              247 Size                           123213.WER234                          113 123213.234
              247 Size                           17                                      31 17
              225 Size                           TASDRTS                                115
              225 Size                           23423                                  113 23423
INVENTORY_ITEM_ID ELEMENT_NAME                   ELEMENT_VALUE        ITEM_CATALOG_GROUP_ID NUM
              225 Size                           5665.09                                 31 5665.09
              199 Size                           89.00                                  115 89.00
13 rows selected.
SQL> SY.