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lookup table & main table relationship


lookup table & main table relationship

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MuditGupta
MuditGupta
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Hi there,

I am working on creating data model from existing database.
Present DB is w/o PK-FKs & I am working to create relational DB which enforces RI etc
I have a lookup table which contains language codes,used by main table. The problem ,I am running into, is that these language codes(from lookup table) are used by 3 columns.
So, I am wondering how can I enforce PK-FK relationship here.
As in...
language_code from lookup table is PK and it has to associated w/ column(s) existing in main table

Thanks
Grant Fritchey
Grant Fritchey
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If I understand the question, you simply add the relationship three different times, relating the lookup value to the three different columns individually. It's a fine method.

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MuditGupta
MuditGupta
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I am using Visio 2007 Professional and it seems VISIO doesn't allow relating a single column (from parent table) to 3 different columns. It associates with Either ColA or ColB or ColC.. not with all of them Sad
Grant Fritchey
Grant Fritchey
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Ah, that's a shortcoming with the tool, not SQL Server. Ummm, you might try associating to the first column and then renaming the association (not sure how to do that) and then try adding to the next column.

----------------------------------------------------
The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood...
Theodore Roosevelt

The Scary DBA
Author of: SQL Server Query Performance Tuning and SQL Server Execution Plans
Product Evangelist for Red Gate Software
MuditGupta
MuditGupta
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SSC-Addicted (423 reputation)SSC-Addicted (423 reputation)SSC-Addicted (423 reputation)SSC-Addicted (423 reputation)SSC-Addicted (423 reputation)SSC-Addicted (423 reputation)SSC-Addicted (423 reputation)SSC-Addicted (423 reputation)

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Thanks for quick response.
yes, its Visio related issue. :-|
thanks
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