Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Select Distinct with mutiple columns and tables

Posted on 2010-11-17
7
Medium Priority
?
438 Views
Last Modified: 2012-05-10
I am having some trouble with aggregate functions in SQL. Please take a look at my example and tell me what I am doing wrong. I am using MS SQL 2005.

Table = T_PLIST
ProdCode
------
ADC113
ADC141
ADC181


Table = T_PRODUCTS
ID      ProdCode       Location      Status
-----------------------------------------------
1      ADC131            NY            InStock
2      ADC141            CA            BackOrderd
3      ADC222            FL            InStock
4      ADC222            FL            BackOrderd
5      ADC181            PA            InStock
6      ADC181            PA            BackOrderd
7      ADC131            CA            InStock
8      ADC141            AL            InStock



What I want to see is.

ID      ProdCode       Location      Status
-----------------------------------------------
6      ADC181            PA            BackOrderd
7      ADC131            CA            InStock
8      ADC141            AL            InStock

Here's what I tried (see code)  that did not work.

Thanks



--This will not work
SELECT	T_PRODUCTS.*
FROM	T_PRODUCTS
	 INNER JOIN [T_PLIST] ON T_PRODUCTS.ProdCode = [T_PLIST].ProdCode

WHERE (SELECT DISTINCT T_PRODUCTS.ProdCode FROM T_PRODUCTS)
ORDER BY T_PRODUCTS.ProdCode, T_PRODUCTS.ID DESC

Open in new window

0
Comment
Question by:strider814
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
7 Comments
 
LVL 58

Expert Comment

by:cyberkiwi
ID: 34160828
Question is, what do you want to see, just the latest ID?

select P.ID, T.ProdCode, P.Location, P.Status
from T_PLIST T LEFT JOIN (
select p.ID, p.ProdCode, p.Location, p.Status, rn=row_number() over (partition by p.ProdCode order by p.ID desc) P on P.ProdCode=T.ProdCode and P.rn=1
0
 

Author Comment

by:strider814
ID: 34160836
Yes just the latest ID
0
 
LVL 58

Expert Comment

by:cyberkiwi
ID: 34160898
Okay, fixed here.

select P.ID, T.ProdCode, P.Location, P.Status
from T_PLIST T LEFT JOIN (
select p.ID, p.ProdCode, p.Location, p.Status, rn=row_number() over (partition by p.ProdCode order by p.ID desc) from t_PRODUCTS) P on P.ProdCode=T.ProdCode and P.rn=1
0
What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

 

Author Comment

by:strider814
ID: 34161055
This is really close but I get back some rows that are completely NULL. Is there anyway to eliminate them? I should also tell you that I want to SELECT INTO a new table if possible

Thanks for your help.
0
 
LVL 58

Accepted Solution

by:
cyberkiwi earned 2000 total points
ID: 34161163
select P.ID, T.ProdCode, P.Location, P.Status
INTO newTableName
from T_PLIST T INNER JOIN (
select p.ID, p.ProdCode, p.Location, p.Status, rn=row_number() over (partition by p.ProdCode order by p.ID desc) from t_PRODUCTS) P on P.ProdCode=T.ProdCode and P.rn=1
0
 

Author Comment

by:strider814
ID: 34161179
I got what i wanted with an INNER JOIN. Thank You very much!

I rewrote the query a little to help newbie DBA's like myself understand it.

 Thank You very much!
SELECT Products.ID, Products.ProdCode,
 Products.Location, Products.Status
FROM Plist INNER JOIN
  (
  SELECT Products.ID, Products.ProdCode,Products.Location, Products.Status,
  rn=ROW_NUMBER() OVER (PARTITION BY Products.ProdCode ORDER BY Products.ID DESC)
  FROM Products
  ) Products ON Plist.ProdCode = Products.ProdCode AND Products.rn=1

Open in new window

0
 

Author Closing Comment

by:strider814
ID: 34161182
Thanks
0

Featured Post

Stack Overflow Podcast - Developer Story

Welcome to the Stack Overflow podcast recorded Thursday July 20 at Stack Overflow Headquearters in NYC. Your hosts today are podcast regulars Jay Hanlon, David Fullerton, and Ilana Yitzhaki, plus the quite irregular Matt Sherman (Stack Overflow Engineering Manager extraordinaire)

Question has a verified solution.

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

PL/SQL can be a very powerful tool for working directly with database tables. Being able to loop will allow you to perform more complex operations, but can be a little tricky to write correctly. This article will provide examples of basic loops alon…
This article explains how to reset the password of the sa account on a Microsoft SQL Server.  The steps in this article work in SQL 2005, 2008, 2008 R2, 2012, 2014 and 2016.
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…

670 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