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Linking Database Tables

Posted on 2008-10-09
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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
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Question by:TommyTwoPints
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BrandonGalderisi earned 500 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.
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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
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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.
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by:TommyTwoPints
ID: 22684677
Thanks alot Brandon, you've been a great help!
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