The INNER JOIN keyword in SQL is used to combine rows from two or more tables based on a related column between them. It returns only the matching rows, making it one of the most commonly used join types in relational database operations.
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Which of the following is the correct syntax for INNER JOIN?
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Question 4 of 15
4. Question
How many tables can be joined using INNER JOIN?
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Question 5 of 15
5. Question
What does the following query do?
SELECT * FROM orders INNER JOIN customers ON orders.customer_id = customers.id;
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Question 6 of 15
6. Question
Which clause is mandatory in an INNER JOIN query?
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Question 7 of 15
7. Question
What will be the result of an INNER JOIN if no matching row exists in the second table?
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Question 8 of 15
8. Question
What is the difference between JOIN and INNER JOIN?
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Question 9 of 15
9. Question
Which query returns employee details along with their department name?
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Question 10 of 15
10. Question
What will be the output of:
SELECT * FROM A INNER JOIN B ON A.id = B.a_id
if A has 4 rows and B has 2 matching rows?
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Question 11 of 15
11. Question
What happens when multiple rows from one table match with a row in another?
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Question 12 of 15
12. Question
What is the output if the joining column contains NULL in one table?
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Question 13 of 15
13. Question
Which clause can be added to filter results after join?
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Question 14 of 15
14. Question
What is the impact of using aliases in INNER JOIN?
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Question 15 of 15
15. Question
What is true about INNER JOIN performance?
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Summary
The INNER JOIN clause is one of the most fundamental concepts in SQL, enabling users to combine related data from multiple tables. It only returns rows that match the join condition in both tables, making it efficient for building meaningful relationships in relational databases.
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