Talk:Functional dependency

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[edit] Relation?

The link to the Relation disambiguation page doesn't seem to be relevant to this database-specific use of the term 'relation'. --VinceBowdren 15:53, 16 August 2006 (UTC)

The definition that 'each X value determines at most one Y value is incorrect. It should be 'each X value determines EXACTLY one Y value.

The test to detemine functional dependency: X->Y TEST: If t1[X]=t2[X] then t1[Y]=t2[Y] i.e. Whenever two tuples agree on their X values, they also agree on their Y values.