[Solved] You wrote this query to find all students and their courses:SELECT Student.Name, Course.Title FROM StudentJOIN StudentCourse ON Student.ID = StudentCourse.StudentIDJOIN Course ON Course.... | SQL

SQL - Table Relationships

You wrote this query to find all students and their courses:

SELECT Student.Name, Course.Title FROM Student
JOIN StudentCourse ON Student.ID = StudentCourse.StudentID
JOIN Course ON Course.ID = StudentCourse.CourseID
WHERE StudentCourse.StudentID = Student.ID;

But it has a problem. What is the problem?

AThe WHERE clause is redundant and causes a syntax error

BMissing alias for tables causes ambiguity

CThe WHERE clause is unnecessary because JOIN already matches IDs

DStudentCourse.CourseID is missing in the WHERE clause

Step-by-Step Solution

Solution:

Step 1: Analyze the JOIN conditions
The JOINs already match Student.ID to StudentCourse.StudentID and Course.ID to StudentCourse.CourseID.
Step 2: Check the WHERE clause
The WHERE clause repeats the JOIN condition, which is unnecessary but not an error; however, it does not filter or add value.
Final Answer:
The WHERE clause is unnecessary because JOIN already matches IDs -> Option C
Quick Check:
JOIN matches IDs, WHERE clause redundant [OK]

Quick Trick: JOIN conditions handle matching; WHERE often not needed here [OK]

Common Mistakes:

MISTAKES

Assuming WHERE clause causes syntax error
Adding unnecessary conditions that duplicate JOINs
Confusing alias usage with errors

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More SQL Quizzes

You wrote this query to find all students and their courses:

Step 1: Analyze the JOIN conditions

Step 2: Check the WHERE clause

Final Answer:

Quick Check:

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