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Staryon
Starting Member
10 Posts |
 Posted - 2006-01-05 : 14:41:11
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| Hi,I need to store a hierarchy in my database (a tree)I have 3 types of data: Cases, Groups and Users. I can have any combination of them.Check the following link ('Groups', 'Cases', 'Users' and 'Tree' will be tables in my database):http://www.lemforever.com/temp/tree.jpgWhat do you guys think? Do you think is a good solution? I still want to have a relational databaseand I don't want to violate any integrity rules.I based my solution on the article found herehttp://www.sqlteam.com/item.asp?ItemID=8866In my case is a little bit more complex, because I have different entities, not only Employees.Thanks a lot. |
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rockmoose
SQL Natt Alfen
3279 Posts |
Posted - 2006-01-05 : 17:18:26
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| Have a constraint such that only one of FK_userID, FK_caseID or FK_groupID is not null.check(case when FK_groupID is null then 0 else 1 end+case when FK_caseID is null then 0 else 1 end+case when FK_userID is null then 0 else 1 end=1)rockmoose |
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Staryon
Starting Member
10 Posts |
Posted - 2006-01-09 : 15:21:00
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| Thanks a lot, rockmoose. I will add that constraint to my database.Best regards |
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Need feedback.What do you think about this design?