Parent to child like query..

Question

Hi all,
I wrote a query like below..
select NO_CONTROL,NO_PO, min(NO_MEND) from
T20_SETT group by NO_CONTROL,NO_PO;
and out put is:
NO_Contorl NO_PUR  MIN(No_amend)
1059           726803    06
0440           734386    01
0213           732374    01
0217           732400    01
0321           733510    01
0462           734299    00Can some suggest changes to query to so that it should list out no_amend by rank (higest to lowest)
Here each Control number have multiple PO numbers and inturn each Po can have multiple Amend numbers.
required output like:
No_control   Po_No     AmendNo
1059           726803    01 (This being min amend no for this PO : 726803)
                  726803    02
1059           726804    01
                  726804    02
                  726804    03
1060           726805    00
                  726805    01 Please dont treat this as duplicate post..as i am struggling to get a solution for this.. any help would be highly appreciated..
sorry if you feel any formatting erros in this post.
Best Regards
Prasanth

Answer 1

You can do the basic output with a simple order by like this:
SQL > WITH t AS (
  2     SELECT 1059 no_control, 726803 no_pur, '01' no_amend FROM dual UNION ALL
  3     SELECT 1059, 726803, '02' FROM dual UNION ALL
  4     SELECT 1059, 726804, '01' FROM dual UNION ALL
  5     SELECT 1059, 726804, '02' FROM dual UNION ALL
  6     SELECT 1059, 726804, '03' FROM dual UNION ALL
  7     SELECT 1060, 726805, '00' FROM dual UNION ALL
  8     SELECT 1060, 726805, '01' FROM dual)
  9  SELECT no_control, no_pur, no_amend
10  FROM t
11  ORDER BY 1, 2, 3;
NO_CONTROL     NO_PUR NO
      1059     726803 01
      1059     726803 02
      1059     726804 01
      1059     726804 02
      1059     726804 03
      1060     726805 00
      1060     726805 01If the formatting you show is important, and cannot be achieved by whatever tool you are runnign the select in, then perhaps something along the lines of:
SQL > WITH t AS (
  2     SELECT 1059 no_control, 726803 no_pur, '01' no_amend FROM dual UNION ALL
  3     SELECT 1059, 726803, '02' FROM dual UNION ALL
  4     SELECT 1059, 726804, '01' FROM dual UNION ALL
  5     SELECT 1059, 726804, '02' FROM dual UNION ALL
  6     SELECT 1059, 726804, '03' FROM dual UNION ALL
  7     SELECT 1060, 726805, '00' FROM dual UNION ALL
  8     SELECT 1060, 726805, '01' FROM dual)
  9  SELECT CASE WHEN rnk = 1 THEN no_control END no_control,
10         CASE WHEN rnk = 1 THEN TO_CHAR(no_pur) ELSE '  '||TO_CHAR(no_pur) END no_pur,
11         no_amend
12  FROM (SELECT no_control, no_pur, no_amend,
13               ROW_NUMBER() OVER(PARTITION BY no_control, no_pur
14                                 ORDER BY no_amend) rnk
15        FROM t) t
16  ORDER BY t.no_control, t.no_pur, t.no_amend;
NO_CONTROL NO_PUR                                     NO
      1059 726803                                     01
             726803                                   02
      1059 726804                                     01
             726804                                   02
             726804                                   03
      1060 726805                                     00
             726805                                   01Note that the alias on the columns in the outer ORDER BY is important to ensure that iOracle uses the "real" columns for the sorting instead of the aliases in the outer query.
John