?
Solved

select distinct multiple collumns

Posted on 2004-08-07
7
Medium Priority
?
1,098 Views
Last Modified: 2012-05-05
Okay guys this is really freakin problems. Suppose I have a table like this

-------------------------------------------
prod_name | price | isbn | details
-------------------------------------------
AA             | 22.0  |655434 | pdetail
AA             | 22.0  |655434 | pdetail
AA             | 22.0  |655434 | Jdetail
BB             | 24.0  |655436 | mdetail
BB             | 24.0  |655436 | mdetail
CC             | 25.0  |655430 | udetail
CC             | 25.0  |655430 | udetail

How do I select a row from the table that has same rows containing prod_name, price, details.

I mean I want the output from the table above as

-------------------------------------------
prod_name | price | isbn | details
-------------------------------------------
AA             | 22.0  |655434 | pdetail
AA             | 22.0  |655434 | Jdetail
BB             | 24.0  |655436 | mdetaill
CC             | 25.0  |655430 | udetail

Will u guys plz help me out.
0
Comment
Question by:dark_in_lights
  • 3
5 Comments
 
LVL 8

Expert Comment

by:sapnam
ID: 11742437
SELECT DISTINCT a.prod_name,a.price,a.isbn,a.details
from your table a
where exists (select b.prod_name,b.price,b.isbn,b.details
                       from your table b
                     where b.prod_name = a.prod_name
                         and b.price = a.price
                         and b.isbn = a.isbn
                         and b.details = a.details
                         and b.rowid <> a.rowid);
0
 
LVL 8

Expert Comment

by:sapnam
ID: 11742458
Or rather why can't it simply be

SELECT DISTINCT a.prod_name,a.price,a.isbn,a.details
from your table a
0
 
LVL 8

Accepted Solution

by:
sapnam earned 1000 total points
ID: 11742467
The first query I posted will give you those rows which are having duplicates in the data.

I tried it out with your test data and the result is

AA        22    655434 pdetail
BB        24    655436 mdetail
CC        25    655430 udetail

So it does not give you

AA        22    655434 jdetail

If you want a listing of all distinct values then you give the second query
0
 
LVL 50

Assisted Solution

by:Lowfatspread
Lowfatspread earned 1000 total points
ID: 11742708
but if you want "duplicates"

then just do

SELECT a.prod_name,a.price,a.isbn,a.details
from your table a
group by a.prod_name,a.price,a.isbn,a.details
having count(*) > 1
0
 
LVL 7

Expert Comment

by:cy_hung
ID: 11745104
A simpler version :

SELECT prod_name price, isbn, details
from table group by prod_name, price, isbn, details

This query should work in IBM DB2 and most popular database but not all .... The behaviour may be differentin MySQL or Sybase ...

By the way, how do you use the result, for report generation or within an application ?

This feature is common is most BI tools, such as Cognos, MicroStrategy and BusinessObjects...  these tools save a lot of times for generate reports.
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In today's business world, data is more important than ever for informing marketing campaigns. Accessing and using data, however, may not come naturally to some creative marketing professionals. Here are four tips for adapting to wield data for insi…
Exchange database can often fail to mount thereby halting the work of all users connected to it. Finding out why database isn’t mounting is crucial and getting the server back online. Stellar Phoenix Mailbox Exchange Recovery is a champion product t…
Video by: Steve
Using examples as well as descriptions, step through each of the common simple join types, explaining differences in syntax, differences in expected outputs and showing how the queries run along with the actual outputs based upon a simple set of dem…
This lesson discusses how to use a Mainform + Subforms in Microsoft Access to find and enter data for payments on orders. The sample data comes from a custom shop that builds and sells movable storage structures that are delivered to your property. …
Suggested Courses

609 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question