Database-Management-System
August 29, 2024Database-Management-System
August 29, 2024Database-Management-System
| Question 699 |
Which of the following statements is false with respect to relational DBMS?
| A disadvantage of highly normalized tables is that queries may require too many time consuming joins | |
| Foreign key constraints are referential integrity constraints | |
| A primary key uniquely identifies a row in a table | |
| Nulls reduce space requirements in tables |
Question 699 Explanation:
Option A: True: depends upon the query, it will give the response
Option B & C: True: Foreign key constraints are referential integrity constraints. A primary key uniquely identifies a row in a table.
Option D: False: Null won’t reduce space requirements in tables.
Option B & C: True: Foreign key constraints are referential integrity constraints. A primary key uniquely identifies a row in a table.
Option D: False: Null won’t reduce space requirements in tables.
Correct Answer: D
Question 699 Explanation:
Option A: True: depends upon the query, it will give the response
Option B & C: True: Foreign key constraints are referential integrity constraints. A primary key uniquely identifies a row in a table.
Option D: False: Null won’t reduce space requirements in tables.
Option B & C: True: Foreign key constraints are referential integrity constraints. A primary key uniquely identifies a row in a table.
Option D: False: Null won’t reduce space requirements in tables.