Top 25 SQL Interview Questions And Answers|SQL Support Interview Questions And Answers| Simplilearn

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[@pattabhik2894]

nth highest salary is offset n-1 right?

[@YashujanuSisters]

Thanks for your video 😊. Its useful

[@kaj661]

I don't think a unique key can be duplicated?
I've learned that the difference between that and a primary key is that a unique key can be NULL?

[@SimplilearnOfficial]

A unique key ensures that all values are unique across the column, but it can contain NULL values (though each NULL is considered unique). In contrast, a primary key also ensures uniqueness but cannot contain NULL values, ensuring every row is uniquely identifiable and not null.

[@osiris8826]

Amazing