Solved

Cross Database Foreign Key Relationship.

Posted on 2009-06-29
8
357 Views
Last Modified: 2012-06-27
Hi,

I have separate database for Master and Transaction.
Due to creating the foreign key of different database, the message shows that it is not supported.

Is there any way (trick) to overcome this beside make them into one database?

Thank you.
0
Comment
Question by:emi_sastra
[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
  • 4
  • 4
8 Comments
 
LVL 60

Expert Comment

by:chapmandew
ID: 24735743
You can create a trigger to enforce the integrity between the 2 tables in the different dbs.
0
 
LVL 1

Author Comment

by:emi_sastra
ID: 24735769
Hi chapmandew,

Very interesting.

How could we do it?

Thank you.
0
 
LVL 60

Accepted Solution

by:
chapmandew earned 500 total points
ID: 24735788
well, on your table transaction, just make sure that the records exist in the other table....kinda like this

use db1

create trigger tr_tranactions
on transaction
for insert, update
as
begin
if not exists(select 1 from db2..master m join inserted i on m.masterid = i.masterid)
rollback transaction
end

this is just a rough outline...
0
Stressed Out?

Watch some penguins on the livecam!

 
LVL 1

Author Comment

by:emi_sastra
ID: 24735823
I see know, manual checking by application or trigger.

When user try to delete the data from the table of Master, then we should check it also it has been used by child table or not?

Thank you.
0
 
LVL 60

Expert Comment

by:chapmandew
ID: 24735835
yes, you'd definetly have to do that too....so, on the master, check for deletes and if they're in the other table.  on the transaction table, make sure any inserts or updates are in the master table...make sense?
0
 
LVL 1

Author Comment

by:emi_sastra
ID: 24736047
Ok.

It is safe use kind of trigger?

Thank you.
0
 
LVL 60

Expert Comment

by:chapmandew
ID: 24736181
sure...
0
 
LVL 1

Author Comment

by:emi_sastra
ID: 24736292
Ok.

Thank you very much for your help.
0

Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

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

Occasionally there is a need to clean table columns, especially if you have inherited legacy data. There are obviously many ways to accomplish that, including elaborate UPDATE queries with anywhere from one to numerous REPLACE functions (even within…
Composite queries are used to retrieve the results from joining multiple queries after applying any filters. UNION, INTERSECT, MINUS, and UNION ALL are some of the operators used to get certain desired results.​
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …

688 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