Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Linking Database Tables

Posted on 2008-10-09
4
Medium Priority
?
173 Views
Last Modified: 2013-11-07
Hi Experts,

Is there a way of being able to create a table in a database that is linked to data in other tables? By this I mean rows/columns (and the data) are pulled in from other tables and are dynamically refreshed/updated.

I am using this within an application so OLEDB commands on how to achieve this would be the most useful.

Thanks in advance

Tom
0
Comment
Question by:TommyTwoPints
[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
  • 2
  • 2
4 Comments
 
LVL 39

Accepted Solution

by:
BrandonGalderisi earned 2000 total points
ID: 22684588
Not a table, but a view yes.


create view vw_MyView
as
select a.column1, b.column2
from yourtable1 a
join yourtable2 b
on a.id=b.id


then just select from the view instead of the table.
0
 
LVL 3

Author Comment

by:TommyTwoPints
ID: 22684609
Hi Brandon,
Thankyou for your quick response. Can we store these views? Will they be dynamically updated if the table they are linked to is changed.
Also; If Column1 doesnt exist anymore; what would happen to the view? Would there be some sort of notification/error?
Thanks
Tom
0
 
LVL 39

Expert Comment

by:BrandonGalderisi
ID: 22684629
When you create the view it is saved in SQL server.  There is no "dynamic update" as the data is not actually stored in the view.  Think of it as a saved select statement.

If column 1 doesn't exist, then you will need to remove it from the view.  If you use the select * from tablea join table...... syntax, then you can issue the sp_refreshview command to refresh it's column after you remove the column.

And yes, there would be an error if you attempt to select from it and the column no longer exists if you do it how I have it above.  I know in SQL 2k, not refreshing the view would cause problems where data would appear under the wrong heading but i think it would still work.  But if you always issue the sp_refreshview command, it will be fine.
0
 
LVL 3

Author Comment

by:TommyTwoPints
ID: 22684677
Thanks alot Brandon, you've been a great help!
0

Featured Post

Nothing ever in the clear!

This technical paper will help you implement VMware’s VM encryption as well as implement Veeam encryption which together will achieve the nothing ever in the clear goal. If a bad guy steals VMs, backups or traffic they get nothing.

Question has a verified solution.

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

In this article I will describe the Copy Database Wizard 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.
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…

715 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