SQL Development
 
Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
 
 
User Name:
Password:
Remember me
Iron Speed
Go Back   ASP Free Forums > Database > SQL Development
Reload this Page

Select Top Unique Records

Discuss Select Top Unique Records in the SQL Development forum on ASP Free.
Select Top Unique Records SQL forums discussing structured query language related questions that are platform independent. Discussions include advanced topics such as joins, stored procedures, and triggers.

Reply
Add This Thread To:
  Del.icio.us   Digg   Google   Spurl   Blink   Furl   Simpy   Y! MyWeb 
« Previous Thread | Next Thread »  
Thread Tools Search this Thread Rate Thread Display Modes
 
Unread ASP Free Forums Sponsor:
Free Web 2.0 Code Generator! Generate data entry and reporting .NET Web apps in minutes. Quickly create visually stunning, feature-rich apps that are easy to customize and ready to deploy. Download Now!
  #1  
Old April 15th, 2008, 06:39 PM
BLarche BLarche is offline
Contributing User
Click here for more information.
  
Join Date: Jan 2007
Location: Indianapolis, USA
Posts: 3,039 BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level)BLarche User rank is Lieutenant Colonel (40000 - 50000 Reputation Level) 
Time spent in forums: 1 Month 3 Days 20 h 31 m 48 sec
Reputation Power: 469
Select Top Unique Records
Okay, I need some help with a SQL query. I have a DB with the following:

Quote:
Table: tblManuals
Fields: ManualID, ManualTypeID, ProductID, ManualPartNumber, ManualDescription, ManualRevision


For each manual, it could have multiple revisions. The way I identify each manual is by the part number, type ID, and product ID. How do I select just the MOST RECENT manual for each revision (in other words, just the most recent revision of the manual).

Some examples of data include:

1, 1, 10, Install Guide, 1
2, 1, 10, Install Guide, 2
3, 2, 12, Service Manual, 1
4, 2, 12, Service Manual, 2
5, 2, 12, Service Manual, 3
6, 1, 10, Install Guide, 3

So, the SQL would just select records 5 and 6, since those are unique manual types and are the most recent revisions.
__________________
"You'll never be as perfect as BLaaaaaaaaarche."
Reply With Quote
  #2  
Old April 16th, 2008, 08:14 AM
Wolffy's Avatar
Wolffy Wolffy is offline
Slaprentice of Wolves
Click here for more information.
  
Join Date: Aug 2007
Location: Mossville, IL
Posts: 1,015 Wolffy User rank is Major (30000 - 40000 Reputation Level)Wolffy User rank is Major (30000 - 40000 Reputation Level)Wolffy User rank is Major (30000 - 40000 Reputation Level)Wolffy User rank is Major (30000 - 40000 Reputation Level)Wolffy User rank is Major (30000 - 40000 Reputation Level)Wolffy User rank is Major (30000 - 40000 Reputation Level)Wolffy User rank is Major (30000 - 40000 Reputation Level)Wolffy User rank is Major (30000 - 40000 Reputation Level)Wolffy User rank is Major (30000 - 40000 Reputation Level)Wolffy User rank is Major (30000 - 40000 Reputation Level) 
Time spent in forums: 1 Week 4 Days 2 h 3 m 50 sec
Reputation Power: 329
See if something like the following gets you close:

SQL Code:
Original - SQL Code 
  1. SELECT a.* FROM tblManuals A
  2. JOIN 
  3.   (SELECT ManualTypeId, MAX(ManualRevision) AS Latest
  4.      FROM tblManuals B
  5.      GROUP BY ManualTypeId)
  6.   ON (a.ManualTypeId = b.ManualTypeId 
  7.         AND a.ManualRevision = b.Latest)
__________________
Wolffy
------------------------
Teaching people to fish.
Reply With Quote
Reply

Viewing: ASP Free Forums > Database > SQL Development > Select Top Unique Records

« Previous Thread | Next Thread »

Thread Tools  Search this Thread 
Search this Thread:

Advanced Search
Display Modes  Rate This Thread 
Linear Mode Linear Mode
Rate This Thread:


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
View Your Warnings | New Posts | Latest News | Latest Threads | Shoutbox
Forum Jump

 Free IT White Papers!
 
Accelerating Trading Partner Performance
One in five. That's how many partner transactions have at least one error. That is an amazing statistic, particularly given the extraordinary leaps in innovation across the global supply chain during the past two decades. Download this white paper to learn more.
 
Competing on Analytics
This Tech Analysis is designed to help identify characteristics shared by analytics competitors, and includes information about 32 organizations that have made a commitment to quantitative, fact-based analysis.
 
Cost Effective Scaling with Virtualization and Coyote Point Systems
An overview of the industry trend toward virtualization, how server consolidation has increased the importance of application uptime and the steps being taken to integrate load balancing technology with virtualized servers.
 
Five Checkpoints to Implementing IP Telephony
Implementation planning for IP PBX software and IP telephony has become vital as businesses replace discontinued legacy PBX phone systems. This informative whitepaper outlines five "checkpoints" for any implementation plan that will help make IP communications a successful proposition.
 
Hosted Email Security: Staying Ahead of New Threats
In the last two years, email has become a fierce battleground between the nefarious forces of spam and malware, and the heroes of messaging protection. The spam volumes increased alarmingly every month, bringing clever new forms of phishing and virus propagation attacks.
 

Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
  
 





© 2003-2008 by Developer Shed. All rights reserved. DS Cluster 4 hosted by Hostway.