What is the difference between an inner join and an outer join? MCQ with Answer and Explanation
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Question #1
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Which clause is used in a SQL SELECT statement to organize matching rows into summary groups based on one or more columns?
Correct Answer: Option B
Explanation:
The GROUP BY clause groups rows that have the same values into summary rows, often used alongside aggregate functions like COUNT(), MAX(), or AVG().
The GROUP BY clause groups rows that have the same values into summary rows, often used alongside aggregate functions like COUNT(), MAX(), or AVG().
This question belongs to:
Computer
Database Management System (DBMS)
Question #2
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Which of the following ensures data integrity in RDBMS?
Correct Answer: Option C
Explanation:
Integrity constraints such as keys enforce rules for valid data.
Integrity constraints such as keys enforce rules for valid data.
This question belongs to:
Computer
Database Management System (DBMS)
Question #3
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In an Entity-Relationship (ER) diagram, what geometric shape is used to represent an entity type?
Correct Answer: Option C
Explanation:
In standard ER modeling notation, rectangles are used to represent entity sets or entity types.
In standard ER modeling notation, rectangles are used to represent entity sets or entity types.
This question belongs to:
Computer
Database Management System (DBMS)
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