Question

The primary key:

(a) Keeps all the tuples of the table small in size.

(b) Keeps all the tuples consistent with each other.

(C) Keeps all the tuples distinct.​

Answer 1

The primary key keeps all the tuples district.

• In DBMS, columns are called as attributes and rows are called as tuples.
• A primary key is the minimal set of columns in a table that uniquely identifies each rows in a table.
• This helps in accessing the rows in a table distinctly.
• In some cases a single attribute alone cannot act as key to uniquely identify rows. In that case more attributes as a set are chosen as primary key

• For example in a table containing Student Name and Student Age, there can be repeating values of student name and age. In this case both student name and student age could be set as primary key to make the rows distinct.

Answer 2

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