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Defining uniqueness of a record with combination of IDs

Posted By:      Posted Date: September 28, 2010    Points: 0   Category :Sql Server


My question may be trivial but I just have a hard time abstracting table relationships :P

I have 3 tables:

[] -> primary key

Datas: [ID], Data
DataValues: DataID, ValueTypeID, Value
ValueTypes: [ID], Name

The first is the main table;
The second is an value-attributing table and reason of this topic;
The third is the value type definer;

The problem is as follows:
I want to be sure on this low-level model that ONE ValueType record only gets refferenced by ONE Data record.

Datas: ID -> 27, Data -> "Some Data"
ValueTypes: ID -> 14, Name -> "Length"
DataValues: DataID -> 27, ValueTypeID -> 14, Value -> 9

I want not to be possible to add another record in DataValues with DataID = 27 AND ValueTypeID = 14
It should allow, though, DataID = 27 AND ValueTypeID = 18 or DataID = 65 AND ValueTypeID = 14, for example.

Thank you,

Matheus Simon.

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