Database-Management-System
August 29, 2024Database-Management-System
August 29, 2024Database-Management-System
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Question 699
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Which of the following statements is false with respect to relational DBMS?
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A disadvantage of highly normalized tables is that queries may require too many time consuming joins
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Foreign key constraints are referential integrity constraints
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A primary key uniquely identifies a row in a table
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Nulls reduce space requirements in tables
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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.