a table named customer has following columns customer ID, name,City,mobile number,. identify which column cannot be specified as primary key and why
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Customer ID and phone number because it's have unique value
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Its a class 10 board question right?
I think city cannot be specified because two persons can also have the same city name.But in primary key it should be unique.
I think city cannot be specified because two persons can also have the same city name.But in primary key it should be unique.
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