Help with Oracle SQL query syntax

Here is the scenario:

-- I have table1 that has one primary key (PK1)
-- Another table called table2 with two primary keys (PK1, LINE#). This table has another column called COL1 that will have values VAL1, VAL2, VAL3 etc. corresponding to LINE# values of 1, 2, 3 and so on

I would like to write a SQL query that will return the following output in one row


Can you help me how I can achieve this?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Bill PrewIT / Software Engineering ConsultantCommented:
I think this should be close to what you want, although I can't test on Oracle right no.

SELECT pk1, LISTAGG(col1, ',') 
FROM table1

Open in new window

Newbie345Author Commented:
Thanks BP. There is not table2 in your query?
Bill PrewIT / Software Engineering ConsultantCommented:
Sorry, in my query table 1 should have been table2.  No need for table1 that I could see.

Big Business Goals? Which KPIs Will Help You

The most successful MSPs rely on metrics – known as key performance indicators (KPIs) – for making informed decisions that help their businesses thrive, rather than just survive. This eBook provides an overview of the most important KPIs used by top MSPs.

Newbie345Author Commented:
Hi bp,
I also need table1 in the query as I need to display some other columns from that. Sorry for not mentioning it earlier. So here is the example output format:

awking00Information Technology SpecialistCommented:
Can you post some sample data and the expected output?
Newbie345Author Commented:
Does this help?

Sample data
slightwv (䄆 Netminder) Commented:
You cannot dynamically create columns at runtime.  You have to know the number of columns before you run the select.

Do you have a maximum number of orders per customer?

If you want a CSV for order numbers instead of individual columns ,we can work with that.
slightwv (䄆 Netminder) Commented:
FYI:  images aren't the best way to provide us sample data and results.  It is hard for us to create test cases.

If you have a MAXIMUM of 10 possible orders try something like the code below.

If you have more just change the 10 in "connect by level <= 10" the the maximum and add the appropriate number of new columns:
max(case when t2.pk2 = 10 then order_num end) order10,
max(case when t2.pk2 = N then order_num end) orderN

drop table tab1 purge;
create table tab1(pk1 number, name varchar2(10), city varchar2(20), state char(2));

insert into tab1 values(100,'John','LA','CA');
insert into tab1 values(200,'Mike','SD','CA');
insert into tab1 values(300,'Bob','Akron','OH');

drop table tab2 purge;
create table tab2(pk1 number, pk2 number, order_num number);

insert into tab2 values(100,1,100001);
insert into tab2 values(100,2,100002);
insert into tab2 values(100,3,100003);
insert into tab2 values(200,1,200001);
insert into tab2 values(200,2,200002);
insert into tab2 values(300,1,300001);
insert into tab2 values(300,2,300002);
insert into tab2 values(300,3,300003);
insert into tab2 values(300,4,300004);

select t1.pk1, name, city, state,
	max(case when t2.pk2 = 1 then order_num end) order1,
	max(case when t2.pk2 = 2 then order_num end) order2,
	max(case when t2.pk2 = 3 then order_num end) order3,
	max(case when t2.pk2 = 4 then order_num end) order4,
	max(case when t2.pk2 = 5 then order_num end) order5,
	max(case when t2.pk2 = 6 then order_num end) order6,
	max(case when t2.pk2 = 7 then order_num end) order7,
	max(case when t2.pk2 = 8 then order_num end) order8,
	max(case when t2.pk2 = 9 then order_num end) order9,
	max(case when t2.pk2 = 10 then order_num end) order10
tab1 t1,
select pk1, pk2, order_num 
from tab2 t2 right outer join ( select level lvl from dual connect by level <= 10) l on t2.pk2 = l.lvl
) t2
where t1.pk1=t2.pk1
group by t1.pk1, name, city, state
order by 1

Open in new window

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Bill PrewIT / Software Engineering ConsultantCommented:
Give this a try, I think it should do the job.

  SELECT tab2.pk1 || ',' ||  || ',' ||  || ',' ||
         tab1.state || ',' || 
         LISTAGG(tab2.order_num, ',') WITHIN GROUP (ORDER BY tab2.pk1, tab2.order_num) AS lineout
    FROM tab2 INNER JOIN tab1 ON tab1.pk1 = tab2.pk1
GROUP BY tab2.pk1,,,
ORDER BY tab2.pk1,,,

Open in new window

Newbie345Author Commented:
Works great. Thanks much.
Bill PrewIT / Software Engineering ConsultantCommented:
Just curious, did you give my solution a try, and if so did it not meet your need for some reason?

Newbie345Author Commented:
Hi Bill,
For some reason, I am getting the error below:

ORA-00923: FROM keyword not found where expected
00923. 00000 -  "FROM keyword not found where expected"
Error at Line: 22 Column: 44
Bill PrewIT / Software Engineering ConsultantCommented:
Odd, I just copied the query right out of the solution post above and ran it again here and got the following.


3 rows selected.

Open in new window

No big deal, not complaining or anything, just wanted to share another (slightly simpler?) way to solve the problem.  Make sure you didn't accidentally mis-copy the query of change anything after copying it.  Can you post the exact query you ran there?

No matter what, glad you have something useful from other posts, I just knew I had tested it before posting so was curious if there was a problem.  I'm a curious sort :-)

Newbie345Author Commented:
Sure Bill. I will give this query another try and will let you know.
FYI, I need fixed number of columns (only three order numbers) so # of columns is not dynamic. Can you modify your query to reflect that and let me know?
slightwv (䄆 Netminder) Commented:
Bill's post creates a CSV not individual columns.  If that is what you want then we can address how this question was closed.

If that isn't what you want, then why bother playing with it?

My guess for the reason it won't work for you is listagg was new to 11g.  If you are using an older version of the database, it won't work and you will have to use another method to create the CSV.

I prefer the XMLAGG trick shown here (unless you are running 9i):

>>I need fixed number of columns (only three order numbers) so # of columns is not dynamic. Can you modify your query to reflect that and let me know?

For a maximum of 3 columns

connect by level <= 10

connect by level <= 3

and remove the MAX calls for columns 4-10.
Bill PrewIT / Software Engineering ConsultantCommented:
If you want individual columns then my approach is not preferred, it's useful for combining values from different rows into a single column.  I took that approach because your original question said the following, although it now appears I may have taken that too literally...

I would like to write a SQL query that will return the following output in one row
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Oracle Database

From novice to tech pro — start learning today.