Need help in the sql query

Question

i have a table
source table :
create table order(name_a varchar2(100),intid number);
insert into order values('a',1);
insert into order values('b',1);
insert into order values('c',1);
insert into order values('d',1);
insert into order values('e',2);
insert into order values('f',2);
insert into order values('g',2);
i need a query , which result in the below output :
if i look for intid=1 the query should give a,b,c,d
if i look for intid=2 the query should give f,g
Thanks

Answer 1

Hi,
781649 wrote:
i have a table
source table :
create table order(name_a varchar2(100),intid number);
insert into order values('a',1);
insert into order values('b',1);
insert into order values('c',1);
insert into order values('d',1);
insert into order values('e',2);
insert into order values('f',2);
insert into order values('g',2);Thanks for posting the CREATE TABLE and INSERT statements; it's very helpful.
i need a query , which result in the below output :
if i look for intid=1 the query should give a,b,c,d
if i look for intid=2 the query should give f,gDid you mean <b>e</b>,f,g ?
That's called String Aggregation , and how to do it depends on your version of Oracle, and your exact requirements.
See thie following page for several techniques:
http://www.oracle-base.com/articles/10g/StringAggregationTechniques.php
If you're using Oracle 10 (or higher), and it's important that the name_a's be in order in the output, then you can do this:
WITH     got_r_num     AS
     SELECT     name_a
     ,     intid
     ,     ROW_NUMBER () OVER ( PARTITION BY  intid
                               ORDER BY          name_a
                       )         AS r_num
     FROM     order_table                    -- ORDER is not a good table name
     WHERE     intid     IN (1)                    -- Optional
SELECT     intid
,     SUBSTR ( SYS_CONNECT_BY_PATH (name_a, ',')
            , 2
            )     AS name_a_list
FROM     got_r_num
WHERE     CONNECT_BY_ISLEAF     = 1
START WITH     r_num     = 1
CONNECT BY     r_num     = PRIOR r_num + 1
     AND     intid     = PRIOR intid
;Starting in Oracle 11.2, LISTAGG is better.
This does not assume that you are getting the output only for a single intid at a time. You can get any number of them in a suingle query. Of course, that number can be 1 if that's what you want.
Edited by: Frank Kulash on Mar 24, 2011 12:19 PM