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What is the primary key?

Sumit Tyagi 21st Nov, 2022

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Sumit Tyagi 21st Nov, 2022

The primary key is the key that identifies a record in the table. This key must contain a UNIQUE value and should not contain a NULL value. A table contains only a single primary key.

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Question : What is primary key. Choose from the options given below -
Option 1: A Primary key is a field or a combination of fields that can uniquely identify a row/tuple in a table/relation.
Option 2: A Primary key in table/relation is any non-primary key field which also stores unique values for each row just like a primary-key does. But only one key is designated as primary key. So unique refers to a unique non-key field of a table.
Option 3: A Primary key is a field of a table which is the primary key of another table through a foreign key a relationship is established between two tables.
Option 4: None of the above

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