a table named customer has following columns customer ID name City mobile number identify which column could be specified as primary key and why
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I think mobile number can be specified as primary key it's value is unique.
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The Name and City could not be specified as primary key because two or more than two persons can have same name and two or more persons may belongs to same city....
gaurav2013c:
This question came in today's exam
Thanks..I too write the same
Yeah its correct.....
but i think city name is more correct because it has a higher chance of two persons having same city name than ur name
See the question again dear...... There was written "Identify which column(s)" it means that there maybe more than one
yes i know that
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