Re: Functional dependencies

Thanks!

2011/6/14 Darren Duncan <darren(at)darrenduncan(dot)net>

> Alpha Beta wrote:
>
>> Hi list, (newbie with databases)
>>
>> I was looking out in net about how can we determine or find all functional
>> dependencies in a relational database, but didn't find.
>>
>> So can please anyone here tell me if functional dependecies for each table
>> of a relational database can be found explicitly or
>> we need algorithms for it or any other way?
>> Best regards!
>>
>
> Look for pairs of columns/attributes X and Y (or X may be a set of
> columns/attrs) where, for every row/tuple having the same value for X, the
> row/tuple always has the same value for Y. In this situation, for the data
> you have at least, there would seem to be a relationship where X determines
> Y and Y depends on X. Use an algorithm that does this looking for pairs. --
> Darren Duncan
>
>