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<Moderator's note: Moved from a technical forum and thus no template.>

I'm solving a problem using tuple relational calculus ( TRC) in DBMS.

Find the name of all the employees who work for XYZ Bank Corporation.

I don't understand why book is using S . We have t . Since both of them represents tuples , we could just use t in place of S and get moving.

Can anyone please explain why we required S ?

I'm solving a problem using tuple relational calculus ( TRC) in DBMS.

__Problem__Find the name of all the employees who work for XYZ Bank Corporation.

__Solution__( as given in my book)I don't understand why book is using S . We have t . Since both of them represents tuples , we could just use t in place of S and get moving.

Can anyone please explain why we required S ?

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