Select all data from the Courses Table and do a Full outer join in the StudentCourses by courseID. Comment which course has no students. This is indicated by a NULL studentID and a NULL CourseID.
Question
Select all data from the Courses Table and do a Full outer join in the StudentCourses by courseID. Comment which course has no students. This is indicated by a NULL studentID and a NULL CourseID.
Solution
Sure, here is a step-by-step guide on how to perform a full outer join on the Courses table and the StudentCourses table by courseID.
- First, you need to select all data from the Courses table. You can do this with the following SQL command:
SELECT * FROM Courses;
- Next, you need to perform a full outer join on the StudentCourses table by courseID. Here is the SQL command for this:
SELECT *
FROM Courses
FULL OUTER JOIN StudentCourses
ON Courses.courseID = StudentCourses.courseID;
-
Now, you should have a combined table that includes all records from both the Courses and StudentCourses tables.
-
To find which course has no students, you need to look for records where both the studentID and courseID are NULL in the StudentCourses table. You can do this with the following SQL command:
SELECT *
FROM Courses
FULL OUTER JOIN StudentCourses
ON Courses.courseID = StudentCourses.courseID
WHERE StudentCourses.studentID IS NULL AND StudentCourses.courseID IS NULL;
- The result of this command will be a list of courses that have no students. These are the courses where both the studentID and courseID are NULL in the StudentCourses table.
Please note that the exact SQL syntax might vary depending on the SQL dialect you are using. The above commands are written in standard SQL.
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