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:
Dell PowerEdge Servers
  #1  
Old May 14th, 2002, 08:17 PM
Scott Stewart Scott Stewart is offline
Codewalkers Newbie (0 - 499 posts)
 
Join Date: Apr 2007
Location: Lake Jackson, TX, USA
Posts: 1 Scott Stewart User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 0
Complex SQL Statement

I am using Access97 and have a db with 7 tables from which I need to draw data. I either get an error or a recset with hundreds of repeated rows (Even using DISTINCT). I can't seem to get the INNER JOIN to work right. From the main table I need to look up 0 or more rows in related tables. The syntax of INNER JOIN is killing me. A typical attempt looks like this:

SELECT EventDate, EventName, PlantName, RegionName, CurrentPrice
FROM (Regions INNER JOIN CurrentPrices ON Regions.RegionID = CurrentPrices.RegionID) INNER JOIN (PlantName INNER JOIN (EventType INNER JOIN Events ON EventType.EventID = Events.EventID) ON PlantName.PlantID = Events.PlantID) ON Regions.RegionID = PlantName.RegionID;

Can someone help me sort out the proper syntax?

Thanks,

:Scott

Reply With Quote
  #2  
Old May 23rd, 2002, 04:06 PM
sau sau is offline
Codewalkers Newbie (0 - 499 posts)
 
Join Date: Apr 2007
Posts: 1 sau User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 0
Send a message via ICQ to sau
RE: Complex SQL Statement

Hmm, maybe you should try the RIGHT and/or LEFT JOIN. If you're using Access, then you can define different join types, when you double click on the join line (in the query wizard win or smht like that).

With regards,

Reply With Quote
  #3  
Old May 24th, 2002, 04:39 AM
Smiley Smiley is offline
Codewalkers Newbie (0 - 499 posts)
 
Join Date: Apr 2007
Location: Australia
Posts: 30 Smiley User rank is Just a Lowly Private (1 - 20 Reputation Level) 
Time spent in forums: < 1 sec
Reputation Power: 2
RE: Complex SQL Statement

You cant look up zero or more rows. Inner join is used for returning records from tables where the joined tables have common data. If there is the possibility that one of the tables has no data that matches that criteria, then you will get no records at all for that match.

I assume that you have used the query builder in Access to build the query in the first place, therefore the query should be syntactically correct, so that means you conditions are wrong.

BTW, DISTINCT doesn't stop it from returning multiple rows, just multiple rows with the same data. If you only want the first row, then you could try SELECT TOP 1 FROM .....

Hope I got that syntax right. That will make it return only one record.

Reply With Quote
Reply

Viewing: Codewalkers ForumsOther TechnologiesDatabase Help > Complex SQL Statement


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