state difference between primary key and cardidate key
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Primary Key is a unique and non-null key which identify a record uniquely in table. A table can have only one primary key. Candidate key is also a unique key to identify a record uniquely in a table but a table can have multiple candidate keys. ... Candidate key column can have null value.
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Primary Key is a unique and non-null key which identify a record uniquely in table. A table can have only one primary key.
Candidate key is also a unique key to identify a record uniquely in a table but a table can have multiple candidate keys.
... Candidate key column can have null value.
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