how to create a constraint/trigger
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Assume I have following three seperate employee tables: Accountant, Manager and Administrator. How can I add a constraint/Trigger (using SS_number) to make sure a employee can only work at one capacity (i.e. someone cannot be both an accountant and a manager)?
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You should not use three different tables.
Put them in one table and add a column with their capacity.
You can add a table with the possible capacities and add a foreign key from your persons table to this table.
Please read articles and books about normalisation of relational databases.
Erik.
P.S. I don't think this is the right forum to post this question.
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Yes, Erik is right, this might be a good start http://www.sqlservercentral.com/columnists/bkelley/normalization.asp .
And, yes, there are more appropriate forum categories like T SQL or General (works always
But unfortunately we can't move threads right now.
Frank
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Frank Kalis
Microsoft SQL Server MVP
Webmaster: http://www.insidesql.org/blogs
My blog: http://www.insidesql.org/blogs/frankkalis/[/url]
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