Relational Data Model

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[@fernandoalaniz-ochoa6485]

really good video / lots of good info. thanks for doing these vidoes

[@marimuthumanoj7206]

your lecture is good and cool
thank you sir

[@adityapaithon6499]

So basically A relation schema may have an attribute that is unique (e.g., a
primary key) in another schema is a foreign key?
Can someone elaborate?

[@mishra5732]

the explaination given are purely abstract, and requires prior understanding of DBMS to understand, it would have been better if more examples and illustration were added to make things easier to understand.

[@shubhsharmaengg]

Sir can you name the software/app you are using in this video for writing.

[@pershibavelusamy9428]

1)sir why A 1st Delhi won't make no meaning..thn.. how it is possible to write A 2nd delhi

[@davidfuss_0075]

as we have defined r and no such tuple is there in r so it makes no meaning (someone correct me if i am wrong :-)

[@studiousamateur9725]

What he says is every tuple in relation is a cross product of the domain, but not every cross product of domain is part of relation. In simple terms, not every combination is present in the database and it may not make any practical sense.

[@devvyas9617]

sir can we write (B,2nd,Delhi)..

[@vishantsingh3525]

yes

[@niladrisarkar3122]

Yes

[@pollapraveenkumaryadav4333]

dev vyas

[@sunilsunil.m2440]

Nice