Database Help
 
Forums: » Register « |  User CP |  Games |  Calendar |  Members |  FAQs |  Sitemap |  Support | 
User Name:
Password:
Remember me
Go Back   Codewalkers ForumsOther TechnologiesDatabase Help

Reply
Add This Thread To:
  Del.icio.us   Digg   Google   Spurl   Blink   Furl   Simpy   Y! MyWeb 
Thread Tools Search this Thread Rate Thread Display Modes
 
Unread Codewalkers Forums Sponsor:
Stay one step ahead of the competition. Evaluate and give feedback on some of the hottest web development tools on the market today. Make your opinion heard! Click Here
  #1  
Old July 16th, 2002, 02:41 AM
EvilivE EvilivE is offline
Codewalkers Newbie (0 - 499 posts)
 
Join Date: Apr 2007
Location: Milwaukee, WI USA
Posts: 291 EvilivE User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 2
Send a message via Yahoo to EvilivE
Help w/query ...

I created a table (help) that I am using to store msgs for a msg board. I would like to query the table to produce a result set that returns a list by most recently posted but also only one result per unique msg_num. This is what the table looks like:
Quote:
topic | msg_num | sub_num | date
------------------------------------------------------
topic 1 1 1 07-15-2002 03:16
topic 2 2 0 07-14-2002 12:45
topic 1 1 0 07-13-2002 10:00

I tried: "select distinct msg_num from help order by date desc" but that doesnt give me msg_num 1 sub_num 1 it uses msg_num 1 sub_num 0.

When a user views the board I want the most recently modified topics to be at the top of the list, much like the way this board shows posts. This way if there is a reply to an old post the query would bring it all the way to the top of the list.

Any help would be greatly appreciated.

Reply With Quote
  #2  
Old July 16th, 2002, 02:43 AM
EvilivE EvilivE is offline
Codewalkers Newbie (0 - 499 posts)
 
Join Date: Apr 2007
Location: Milwaukee, WI USA
Posts: 291 EvilivE User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 2
Send a message via Yahoo to EvilivE
RE: Help w/query ...

Maybe this will be easier to read:
php Code:
Original - php Code
  1.  
  2. topic      | msg_num | sub_num | date
  3. ------------------------------------------------------
  4. topic_1       1         1      07-15-2002 03:16
  5. topic_2       2          0      07-14-2002 12:45
  6. topic_1       1         0      07-13-2002 10:00

Reply With Quote
  #3  
Old July 16th, 2002, 03:17 AM
Matt Matt is offline
Moderator
Codewalkers Specialist (4000 - 4499 posts)
 
Join Date: Apr 2007
Location: Florida
Posts: 4,158 Matt User rank is Private First Class (20 - 50 Reputation Level)Matt User rank is Private First Class (20 - 50 Reputation Level) 
Time spent in forums: 4 h 10 m 23 sec
Reputation Power: 6
RE: Help w/query ...

Give this a try:

SELECT msg_num, MAX(date) from help GROUP BY msg_num

Let me know how it goes...

Reply With Quote
  #4  
Old July 16th, 2002, 08:06 AM
EvilivE EvilivE is offline
Codewalkers Newbie (0 - 499 posts)
 
Join Date: Apr 2007
Location: Milwaukee, WI USA
Posts: 291 EvilivE User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 2
Send a message via Yahoo to EvilivE
RE: Help w/query ...

MAX, how did I forget about MAX? :rolleyes: That looks really promising I am going to try it now.

Thanks

Reply With Quote
  #5  
Old July 16th, 2002, 08:13 AM
EvilivE EvilivE is offline
Codewalkers Newbie (0 - 499 posts)
 
Join Date: Apr 2007
Location: Milwaukee, WI USA
Posts: 291 EvilivE User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 2
Send a message via Yahoo to EvilivE
RE: Help w/query ...

Beutiful! I knew there was a reason why I hung out around here

With a little tweakin' I got it to work. Here is the final query for completeness:
select topic, msg_num, max(date) as msg_seq from help group by msg_num order by msg_seq desc

Thank you very much

Reply With Quote
Reply

Viewing: Codewalkers ForumsOther TechnologiesDatabase Help > Help w/query ...


Thread Tools  Search this Thread 
Search this Thread:

Advanced Search
Display Modes  Rate This Thread 
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 &quot;checkpoints&quot; 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 5 hosted by Hostway