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STQC-NIELIT STA 2021
October 19, 2023
Raster-Systems
October 19, 2023
STQC-NIELIT STA 2021
October 19, 2023
Raster-Systems
October 19, 2023

Database-Management-System

Question 415
Which of the following constraints enforces that the value of the primary key cannot be Null?
A
Key Constraint
B
Foreign key constraint
C
Entity integrity constraint
D
Domain constraint
Question 415 Explanation: 
The entity integrity constraint states that primary key value can’t be null. This is because the primary key value is used to identify individual rows in relation and if the primary key has a null value, then we can’t identify those rows.
Correct Answer: C
Question 415 Explanation: 
The entity integrity constraint states that primary key value can’t be null. This is because the primary key value is used to identify individual rows in relation and if the primary key has a null value, then we can’t identify those rows.
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