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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.
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nth highest salary is offset n-1 right?
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?
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.
Thanks for your video 😊. Its useful
Amazing
do they ask questions like this