Database - The Relational Model and Normalization - Discussion
Discussion Forum : The Relational Model and Normalization - General Questions (Q.No. 5)
5.
The primary key is selected from the:
Discussion:
15 comments Page 2 of 2.
Sanjib said:
1 decade ago
Minimum super key called composit key.
But what is candidate key?
But what is candidate key?
Jyoti said:
1 decade ago
Practically candidate key has no appearance in database so we choose primary keys from candidate keys for the practical implementation.
Suraj R. said:
1 decade ago
Candidate key is a set of keys or attributes of an entity which are eligible to be a primary key at some time.
Raku said:
1 decade ago
Composite keys consist of set keys.
Uday kiran said:
1 decade ago
A primary key is taken from the Superkey, which is the set of candidate keys and other attributes. And the attributes other than.
Candidate key is not possible, so primary key is selected from candidate keys.
Candidate key is not possible, so primary key is selected from candidate keys.
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