Changing Quantification and Safe Expression | Tuple Relational Calculus

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[@namangoyal8477]

This video is really good. Thanks and keep up the good Work. :D

[@poornimab6067]

Really good explanation

[@himanshukumarsinha3886]

when and why we use these quantifiers?

[@Ankit-we8ym]

sir how to check whether a expression in relational calculus is safe or not please explain urgent

[@deepdhanuka3881]

I dont think you can say it as infinite The count of all the tuples in all the databases around the world is very huge but you cant say infinite That just means you counted infinity Btw great video learned a lot(probably infinity as well :P) No genuinely thanks

[@PerrySan]

when we write d(dependent(d) ^........ we mean that d is the tuple belonging to the relation Dependent, but why don't we write d/dependent(d)^, why dp we use ( after d instead of /

[@adarshhumne3942]

What does no dependent mean?

[@troykachor3521]

+Adarsh Humne In a company, some employees have children or spouses who would be "Dependants". He doesn't show the schema, but the schema would have an entity titled "Dependants" who would have attributes, name, sex, bdate etc. He is looking for employees who have NO Dependents at all. (most of us computer scientists) :(

[@debrajdas4527]

8:00 it really frustrates when you can't express what you want to, doesn't it ? :D

[@PerrySan]

8.01 to be precise ..

[@nikitasukhwal8430]

Explanation is good but videos are very slow even at 2X speed.

[@himanshukumarsinha3886]

when and why we use these quantifiers?