What is a primary key in database..?

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Saif Nazam

Primary key is unique key in database
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Tutor

mr rajesh the primary key in a rational database is one only. that is a unique no.
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It's a indentity of a database the content in it is not repeated For example. ID number of a student can be use as a primary key as every student will have different identities.
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Maths and physics teacher till engineering level

unique key
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unique identification is known as primary key
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it is a unique field.....for ex admission no. in school will be unique and every child will have a specefic admssn no
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