Solved

SQL update trigger based on value

Posted on 2010-11-09
9
315 Views
Last Modified: 2012-05-10
I need a trigger to do the following:

when deletionstatecode is set to 2 in table 'aaa', update statecode value to 1 in table 'bbb' where aaa.activityid = bbb.phonecallid
AAA
aaaid   deletionstatecode    activityid

--------------------------------------
BBB
bbbid   phonecallid   statecode

Open in new window

0
Comment
Question by:sailing_12
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
9 Comments
 
LVL 69

Accepted Solution

by:
Scott Pletcher earned 400 total points
ID: 34097736
CREATE TRIGGER aaa_trigger_1
ON aaa
AFTER UPDATE
AS
IF @@ROWCOUNT = 0
    RETURN
IF NOT UPDATE(deletionstatecode)
    RETURN
UPDATE bbb
SET bbb.statecode = 1
FROM bbb
INNER JOIN inserted i ON i.activityid = b.phonecallid
INNER JOIN deleted d ON i.activityid = d.activityid
WHERE i.deletionstatecode = 2
  AND (i.deletionstatecode <> d.deletionstatecode OR d.deletionstatecode IS NULL)
0
 
LVL 22

Expert Comment

by:dportas
ID: 34098053
Do it in a stored procedure, not a trigger. Even better, consider changing the design so that there isn't a dependency between columns in two base tables. Maybe you could derive the same information in a view or query instead.
0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 34098135
A trigger is safer than a stored proc.  There is no guarantee that a stored proc will be used for all UPDATEs (and/or INSERTs).
0
Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

 
LVL 14

Expert Comment

by:Emes
ID: 34098412
CREATE TRIGGER TRIG2 ON AAA
For update
as

update BBB
set statecode = 1
 
 FROM inserted i
INNER JOIN bbb ON
BBB.phonecallid = i.activityid
and i.deletionstatecode = 2
0
 

Author Comment

by:sailing_12
ID: 34102700
Scott, on your first inner join, I see alias b on phonecallid - but where is this defined?
0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 34106392
Sorry, should be bbb.
0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 34106394
I.e.:

INNER JOIN inserted i ON i.activityid = bbb.phonecallid
0
 

Author Comment

by:sailing_12
ID: 34106564
OK thanks.
0
 

Author Closing Comment

by:sailing_12
ID: 34106569
Thanks.
0

Featured Post

Webinar: Aligning, Automating, Winning

Join Dan Russo, Senior Manager of Operations Intelligence, for an in-depth discussion on how Dealertrack, leading provider of integrated digital solutions for the automotive industry, transformed their DevOps processes to increase collaboration and move with greater velocity.

Question has a verified solution.

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

JSON is being used more and more, besides XML, and you surely wanted to parse the data out into SQL instead of doing it in some Javascript. The below function in SQL Server can do the job for you, returning a quick table with the parsed data.
Load balancing is the method of dividing the total amount of work performed by one computer between two or more computers. Its aim is to get more work done in the same amount of time, ensuring that all the users get served faster.
Viewers will learn how the fundamental information of how to create a table.
Viewers will learn how to use the UPDATE and DELETE statements to change or remove existing data from their tables. Make a table: Update a specific column given a specific row using the UPDATE statement: Remove a set of values using the DELETE s…

752 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