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How do I connect the primary key or unique key in the best way?

kenuk110
kenuk110 asked
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Last Modified: 2012-05-10
Hi,

I've searched google etc for an understanding on Primary Keys and Unique Keys but I thought I'd ask here too.

I have a few tables that I want to make sure that ONLY the values in those tables are entered in to a master one.

So, I have:

Country
pk                         - bigint,  indentity auto incerment (1)
countryCode             - nvarchar(3)
countryName             - nvarchar(150)

City
pk                         - bigint,  indentity auto incerment (1)
countryCode             - nvarchar(3)
cityCode                   - nvarchar(3)
cityName             - nvarchar(150)

Store
pk                         - bigint,  indentity auto incerment (1)
countryCode             - nvarchar(3)
cityCode                   - nvarchar(3)
cityName             - nvarchar(150)
storeCode             - nvarchar(3)
storeName             - nvarchar(150)

Now, I have them set up with the PK in each then I use a UNIQUE key between them to only get the values from the other table, so store gets City and City gets Country.

Is this right?

It seems that going down the line a few level that the end table of the unique string could be really long!

Any help or guidance would be much appreciated.

Regards,

Ken
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