STQC-NIELIT STA 2021
October 19, 2023Raster-Systems
October 19, 2023Database-Management-System
Question 415 |
Which of the following constraints enforces that the value of the primary key cannot be Null?
Key Constraint | |
Foreign key constraint | |
Entity integrity constraint | |
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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