W8D1 - Lecture 6

W8D1 - Lecture 6

Vocational training

5 Qs

quiz-placeholder

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W8D1 - Lecture 6

W8D1 - Lecture 6

Assessment

Quiz

Other

Vocational training

Practice Problem

Medium

Created by

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?

  1. It allows joining multiple tables in one query.

  1. It improves readability and allows for better query organization.

  1. 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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