DBMS - Keys Unique, Surrogate, Composite

[@TutorialsPoint_]

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[@TheWatchmaan]

You are one of the best teachers I have seen online. From last 2 years your lectures are life saver for me in every semester.

[@arunkumarg3157]

Awesome explanation I've searched for explanation of keys in many websites and videos. Sir, your way of explaining things are very clear and much understandable. Thanks for the lecture.

[@vinerskaadda6852]

Really you are a good teacher having excellent communication skills and depth subject knowledge .

[@monilpanchal]

Very simple, precise, and practical explanation.

[@smurfmoniquii]

Thank you so much for all of your videos. I've been taking a database class online and its nice to have some actual instruction led videos

[@iamjuliana]

Very clear! Thank you so much!

[@pabitraroy3907]

Thank you sir.

[@bhaktijpatil]

you are god , sir. dhanyavaad

[@kalyankumar1372]

What a lecture sir.. thank you soo much

[@Ashok-oe3lo]

Unique key can hold only one null value, so example can be different to explain this. But thanks for your time

[@raftiradiana7560]

Thank you Sir :)

[@pankajrohira1341]

Sir as you told primary key can not be updateded, and in example of students you took the class as a primary key, so if a student will clear the class then database should be updated. So our primary key should be something else.

[@awalktoinfinity665]

What ..? You are wrong here .. Primary key attribute values are updatable ... I have done that : but make sure that it is unique from others in that attribute. Please correct it