hi,
thank you for reply, and help

i don't need it ,

thanks again.

best regards

m.qasem




>>hi all,
>>any idea .
>>
>>Consider the following set of functional dependancies :
>>
>>
>>
>>F = { AB ــ> CD , D ـــ> EF , G ــــ> A , Eــــــ>B , C ــــ> G }
>>
>>
>>
>>a- prove that the following two functional dependencies are entailed by F , using only the definition of a functional dependency :
>>
>>
>>
>>1 - DG ــــ> AEF
>>
>>2 - EG ـــــ> FG
>>
>>thanks.
>
>What do you mean with "functional dependency"? And what do the combinations, like "AB" or "EF" stand for?