Solved

Reworking a NOT IN query

Posted on 2014-03-12
8
191 Views
Last Modified: 2014-03-13
Can you advise on how to rework this section? using a JOIN or the best method for tuning? thanks!


AND 
 ( 
TrainingCourse.TrainingCourseId IN (Select TrainingCourseId from TrainingCourseUnit WHERE UnitId IN (Select UnitId from EmployeeUnitJobTypeUnitView where EmployeeId = Employee.EmployeeId))
 OR 
TrainingCourse.TrainingCourseId NOT IN (Select TrainingCourseId from TrainingCourseUnit)
 ) 

Open in new window

0
Comment
Question by:Starr Duskk
  • 4
  • 3
8 Comments
 
LVL 69

Expert Comment

by:ScottPletcher
ID: 39924144
To best analyze/correct performance, would need to see the definition of "EmployeeUnitJobTypeUnitView" and the current query plan for this code snippet.
0
 
LVL 1

Author Comment

by:Starr Duskk
ID: 39924188
Can you just give me a generalization on if I'm using a

where NOT IN (select....

you suggest something better....

like instead of using a

where IN (select

I'd use a join clause.

thanks.
0
 
LVL 40

Expert Comment

by:Sharath
ID: 39925133
Provide the complete query.
0
 
LVL 1

Author Comment

by:Starr Duskk
ID: 39925240
select * from table where otherfieldID NOT IN (select otherfieldID from OtherTable)
0
Backup Your Microsoft Windows Server®

Backup all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

 
LVL 40

Expert Comment

by:Sharath
ID: 39925643
I don't think you provided the complete query. There is Employee in the WHERE condition. Without knowing the full query, its tough to reconstruct.
0
 
LVL 1

Author Comment

by:Starr Duskk
ID: 39925893
Okay, PLEASE FORGET my first example.

All I want to know is another option for a NOT IN.

Can anyone please give me some examples based on this simple little query?

select * from table where otherfieldID NOT IN (select otherfieldID from OtherTable)

thanks.
0
 
LVL 40

Accepted Solution

by:
Sharath earned 500 total points
ID: 39926655
SELECT T1.*
FROM Table1 T1
LEFT JOIN Table2 T2
ON T1.JoinColumn = T2.JoinColumn
WHERE T2.JoinColumn IS NULL
0
 
LVL 1

Author Closing Comment

by:Starr Duskk
ID: 39927989
Excellent! Thanks!
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

In this article I will describe the Backup & Restore method as one possible migration process and I will add the extra tasks needed for an upgrade when and where is applied so it will cover all.
Ever needed a SQL 2008 Database replicated/mirrored/log shipped on another server but you can't take the downtime inflicted by initial snapshot or disconnect while T-logs are restored or mirror applied? You can use SQL Server Initialize from Backup…
Using examples as well as descriptions, and references to Books Online, show the different Recovery Models available in SQL Server and explain, as well as show how full, differential and transaction log backups are performed
Via a live example, show how to backup a database, simulate a failure backup the tail of the database transaction log and perform the restore.

947 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

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now