Row comparision

Question

hi,
I have a table naming CODE_ROW with 3 columns ECHO,ABC,RESULT_OUT
ECHO ABC RESULT_OUT
eco1234     abc123     4567
eco1234     abc123     63738
eco1234     abc123     73738
eco1234     abc124     4567
eco1234     abc124     8787
eco1234     abc124     63738
eco1234     abc125     4567
eco1234     abc125     63738
The output which I need is like :
o/p
eco1234 abc123,abc124,abc125 4567,63738
eco1234 abc124 8787
eco1234 abc123 73738
In the column ABC the value abc123,abc124 and abc125 are having common values in the 3rd column RESULT_OUT i.e 4567,63738
So in the output the 1st row shud have all the common values that are in ABC concatinated with 'coma'.
And the next rows shuc contain the distinct values of column ABC.
So basically it is row comparision.
Can anyone please help me out in solving dis by using only select query without using Procedures,Cursors etc.
Edited by: user11345528 on Dec 2, 2009 10:50 PM

Answer 1

First of all let's extract all rows from t with two new columns:
RNUM is the rownum resetted at (result_out, echo) level
TOT is the total number of rows for that (result_out, echo) couple.
SVIL>with t as (
  2  select 'eco1234' ECHO, 'abc123' ABC,  4567 RESULT_OUT from dual union
  3  select 'eco1234','abc123', 63738 from dual union
  4  select 'eco1234','abc123', 73738 from dual union
  5  select 'eco1234', 'abc124', 4567 from dual union
  6  select 'eco1234', 'abc124', 8787 from dual union
  7  select 'eco1234', 'abc124', 63738 from dual union
  8  select 'eco1234', 'abc125', 4567 from dual union
  9  select 'eco1234', 'abc125', 63738 from dual
10  )
11  select echo, result_out, abc, rank() over(partition by echo, result_out order by rownum) rnum,
12         count(0) over (partition by echo, result_out) tot from t;
ECHO    RESULT_OUT ABC                                  RNUM        TOT
eco1234       4567 abc123                                  1          3
eco1234       4567 abc124                                  2          3
eco1234       4567 abc125                                  3          3
eco1234       8787 abc124                                  1          1
eco1234      63738 abc123                                  1          3
eco1234      63738 abc124                                  2          3
eco1234      63738 abc125                                  3          3
eco1234      73738 abc123                                  1          1Then let's extract these records in a hierarchical structure applying sys_connect_by_path to concatenate the values of the abc field. Go to the following page to get further information about this tecnique
Link:http://www.oracle-base.com/articles/10g/StringAggregationTechniques.php
SVIL>with t as (
  2  select 'eco1234' ECHO, 'abc123' ABC,  4567 RESULT_OUT from dual union
  3  select 'eco1234','abc123', 63738 from dual union
  4  select 'eco1234','abc123', 73738 from dual union
  5  select 'eco1234', 'abc124', 4567 from dual union
  6  select 'eco1234', 'abc124', 8787 from dual union
  7  select 'eco1234', 'abc124', 63738 from dual union
  8  select 'eco1234', 'abc125', 4567 from dual union
  9  select 'eco1234', 'abc125', 63738 from dual
10  )
11    select echo, ltrim(sys_connect_by_path(abc,','),',') abc, result_out
12      from (select echo, result_out, abc, rank() over(partition by echo, result_out order by rownum) rnum,
13                   count(0) over (partition by echo, result_out) tot from t
14           )
15  where rnum=tot
16  connect by prior rnum+1=rnum and prior echo=echo and prior result_out=result_out
17  start with rnum=1;
ECHO    ABC                            RESULT_OUT
eco1234 abc123,abc124,abc125                 4567
eco1234 abc124                               8787
eco1234 abc123,abc124,abc125                63738
eco1234 abc123                              73738Finally let's repeat the previous step starting from the above query to aggregate the result_out column too:
SVIL>with t as (
  2  select 'eco1234' ECHO, 'abc123' ABC,  4567 RESULT_OUT from dual union
  3  select 'eco1234','abc123', 63738 from dual union
  4  select 'eco1234','abc123', 73738 from dual union
  5  select 'eco1234', 'abc124', 4567 from dual union
  6  select 'eco1234', 'abc124', 8787 from dual union
  7  select 'eco1234', 'abc124', 63738 from dual union
  8  select 'eco1234', 'abc125', 4567 from dual union
  9  select 'eco1234', 'abc125', 63738 from dual
10  )
11  select echo, abc, ltrim(sys_connect_by_path(result_out,','),',') result_out
12  from (select echo, abc, result_out, rank() over(partition by echo, abc order by rownum) rnum,
13               count(0) over (partition by echo, abc) tot
14          from (
15            select echo, ltrim(sys_connect_by_path(abc,','),',') abc, result_out
16              from (select echo, result_out, abc, rank() over(partition by echo, result_out order by rownum) rnum,
17                           count(0) over (partition by echo, result_out) tot from t
18                   )
19          where rnum=tot
20          connect by prior rnum+1=rnum and prior echo=echo and prior result_out=result_out
21          start with rnum=1)
22       )
23  where rnum=tot
24  connect by prior rnum+1=rnum and prior echo=echo and prior abc=abc
25  start with rnum=1;
ECHO    ABC                            RESULT_OUT
eco1234 abc123                         73738
eco1234 abc123,abc124,abc125           4567,63738
eco1234 abc124                         8787Max