How find out the duplicate value from each columns.

Question

I have below four columns,
How can i find out the duplicate value from each columns.
with All_files as (
select '1000' as INVOICE,'2000' AS DELIVERYNOTE,'3000' CANDELINVOICE,'4000' CANDELIVERYNOTE from dual union all
select '5000','6000','7000','8000' from dual union all
select '9000','1000','1100','1200' from dual union all
select '1200','3400','6700','8790' from dual union all
select '1000','2000','3000','9000' from dual union all
select '1230','2340','3450','4560' from dual
SELECT * FROM All_files
Output should be as per below.
1000 2000 3000 4000
9000 1000 1100 1200
1200 3400 6700 8790
1000 2000 3000 9000
Required to check uniqueness in cross columns.
Thanks.

Answer 1

Try this (sorry about the formatting)...
WITH all_files AS (SELECT   '1000' AS INVOICE,
                            '2000' AS DELIVERYNOTE,
                            '3000' CANDELINVOICE,
                            '4000' CANDELIVERYNOTE
                     FROM   DUAL
                   UNION ALL
                   SELECT   '5000',
                            '6000',
                            '7000',
                            '8000'
                     FROM   DUAL
                   UNION ALL
                   SELECT   '9000',
                            '1000',
                            '1100',
                            '1200'
                     FROM   DUAL
                   UNION ALL
                   SELECT   '1200',
                            '3400',
                            '6700',
                            '8790'
                     FROM   DUAL
                   UNION ALL
                   SELECT   '1000',
                            '2000',
                            '3000',
                            '9000'
                     FROM   DUAL
                   UNION ALL
                   SELECT   '1230',
                            '2340',
                            '3450',
                            '4560'
                     FROM   DUAL),
    t_base
       AS (SELECT      invoice
                    || ','
                    || deliverynote
                    || ','
                    || candelinvoice
                    || ','
                    || candeliverynote
                       str
             FROM   all_files),
    t_str
       AS (SELECT   str || ',' AS str,
                    (LENGTH (str) - LENGTH (REPLACE (str, ','))) + 1
                       AS no_of_elements
             FROM   t_base),
    t_n_rows
       AS (    SELECT   LEVEL AS i
                 FROM   DUAL
           CONNECT BY   LEVEL <=
                           (    SELECT   SUM (no_of_elements) FROM t_str)),
    t_build AS (SELECT   t_str.str,
                         nt.i AS element_no,
                         INSTR (t_str.str,
                                DECODE (nt.i, 1, 0, 1),
                                DECODE (nt.i, 1, 1, nt.i - 1))
                         + 1
                            AS start_pos,
                         INSTR (t_str.str,
                                1,
                                DECODE (nt.i, 1, 1, nt.i))
                            AS next_pos
                  FROM      t_str
                         JOIN
                            t_n_rows nt
                         ON nt.i <= t_str.no_of_elements),
    t_build2
       AS (SELECT   RTRIM (str, ',') AS original_string,
                    SUBSTR (str, start_pos, (next_pos - start_pos))
                       AS single_element,
                    element_no
             FROM   t_build),
    t_build3
       AS (SELECT   single_element,
                    COUNT( * )
                       OVER (PARTITION BY single_element
                             ORDER BY single_element)
                       ele_count
             FROM   t_build2)
SELECT   DISTINCT INVOICE,
                  DELIVERYNOTE,
                  CANDELINVOICE,
                  CANDELIVERYNOTE
  FROM   all_files, t_build3
WHERE   ele_count > 1
         AND (   INVOICE = single_element
              OR DELIVERYNOTE = single_element
              OR CANDELINVOICE = single_element
              OR CANDELIVERYNOTE = single_element)I think this will be faster than the previous solution?
Cheers
Ben
Edited by: Munky on Feb 17, 2011 2:11 PM - "I think this will be faster than the previous solution?", nope - it's not :(