W8D1 - Lecture 6
Quiz
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Other
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Vocational training
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Practice Problem
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Medium
Intan Lestari
Used 3+ times
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5 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which SQL clause would you use to apply conditional logic within a query to classify values into different groups?
GROUP BY
CASE WHEN
HAVING
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
What is the primary difference between the INNER JOIN and LEFT JOIN in SQL?
INNER JOIN returns all rows from both tables; LEFT JOIN returns only matching rows.
INNER JOIN returns only matching rows from both tables, while LEFT JOIN returns all rows from the left table and matching rows from the right.
LEFT JOIN returns all rows from both tables, while INNER JOIN returns only matching rows.
3.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
What is the main benefit of using a CTE (Common Table Expression) over a subquery in SQL?
It allows joining multiple tables in one query.
It improves readability and allows for better query organization.
It automatically optimizes query performance.
4.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which SQL operation allows you to combine the result sets of two or more SELECT statements, ensuring no duplicate records by default?
UNION
JOIN
GROUP BY
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
When using CASE WHEN in SQL, what does it do?
It changes the data type of a column.
It allows for conditional logic to return different results based on specific conditions.
It removes duplicates from the result set.
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