Solution:Step 1: Analyze the LEFT JOINLEFT JOIN keeps all authors even if they have no matching books.Step 2: Understand GROUP BY and COUNTGrouping by author name counts books per author; authors with no books show count 0.Final Answer:Each author with the number of books they wrote, including autho

[Solved] Given these tables:Authors(AuthorID, Name)Books(BookID, Title, AuthorID)What will this query return?SELECT Name, COUNT(BookID) AS BookCount FROM Authors LEFT JOIN Books ON Authors.AuthorID = Books.... | SQL

SQL - Table Relationships

Given these tables:
Authors(AuthorID, Name)
Books(BookID, Title, AuthorID)
What will this query return?

SELECT Name, COUNT(BookID) AS BookCount FROM Authors LEFT JOIN Books ON Authors.AuthorID = Books.AuthorID GROUP BY Name;

AEach author with the number of books they wrote, including authors with zero books

BOnly authors who have written at least one book with their book count

CAll books with their authors' names repeated for each book

DAn error because GROUP BY is missing AuthorID

Step-by-Step Solution

Solution:

Step 1: Analyze the LEFT JOIN
LEFT JOIN keeps all authors even if they have no matching books.
Step 2: Understand GROUP BY and COUNT
Grouping by author name counts books per author; authors with no books show count 0.
Final Answer:
Each author with the number of books they wrote, including authors with zero books -> Option A
Quick Check:
LEFT JOIN + GROUP BY = all authors with book counts [OK]

Quick Trick: LEFT JOIN keeps all 'one' side rows even without matches [OK]

Common Mistakes:

MISTAKES

Thinking authors with zero books are excluded
Confusing LEFT JOIN with INNER JOIN
Assuming GROUP BY needs AuthorID instead of Name

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More SQL Quizzes

Given these tables:

Step 1: Analyze the LEFT JOIN

Step 2: Understand GROUP BY and COUNT

Final Answer:

Quick Check:

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