Solved

Query runs too slowly

Posted on 2013-01-17
3
175 Views
Last Modified: 2013-01-21
Here's the query:

SELECT   *
      FROM NC2 a LEFT OUTER JOIN Actions b ON  a.UniqueID = b.DealerID
      WHERE  NOT EXISTS (
                     SELECT c.DealerID
                     FROM    Actions c
                     WHERE  c.DealerID = b.DealerID
                     AND       c.EventID = 1
       )

It works, but it can take over a minute to return records.  The 2 tables only have a few hundred records each.

What I need it to do is the following:

Select every record in NC2 UNLESS the value of UniqueID in NC2 matches up with a field called DealerID in a table called Actions., and then only if they match and the EventID is equal to 1.

Thanks
0
Comment
Question by:Rush_2112
  • 2
3 Comments
 
LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 38788227
you need a index on Actions table, field DealerID
that should help alot.
after that, please show the explain plan of the query
0
 
LVL 1

Author Comment

by:Rush_2112
ID: 38793651
how do i do an explain plan?
0
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 38793676
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

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

Suggested Solutions

Introduction In this article, I will by showing a nice little trick for MySQL similar to that of my previous EE Article for SQLite (http://www.sqlite.org/), A SQLite Tidbit: Quick Numbers Table Generation (http://www.experts-exchange.com/A_3570.htm…
Popularity Can Be Measured Sometimes we deal with questions of popularity, and we need a way to collect opinions from our clients.  This article shows a simple teaching example of how we might elect a favorite color by letting our clients vote for …
This Micro Tutorial will teach you how to censor certain areas of your screen. The example in this video will show a little boy's face being blurred. This will be demonstrated using Adobe Premiere Pro CS6.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

776 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