SELECT DISTINCT LastName, FirstNameFROM Instructors i JOIN Courses c ON i.InstructorID = c.InstructorIDORDER BY LastName, FirstName ; Write a SELECT statement (Commented as 5A-2 ) that returns the same result set as this SELECT statement, but don’t use a join. Instead, use a subquery in a WHERE clause that uses the IN
Question
SELECT DISTINCT LastName, FirstNameFROM Instructors i JOIN Courses c ON i.InstructorID = c.InstructorIDORDER BY LastName, FirstName ; Write a SELECT statement (Commented as 5A-2 ) that returns the same result set as this SELECT statement, but don’t use a join. Instead, use a subquery in a WHERE clause that uses the IN
Solution
Sure, here is the equivalent SQL statement using a subquery in a WHERE clause instead of a JOIN:
-- 5A-2
SELECT DISTINCT LastName, FirstName
FROM Instructors
WHERE InstructorID IN (SELECT InstructorID FROM Courses)
ORDER BY LastName, FirstName;
This statement first selects the InstructorID from the Courses table in the subquery. Then, in the main query, it selects the distinct LastName and FirstName from the Instructors table where the InstructorID is in the list of IDs returned by the subquery. Finally, it orders the result set by LastName and FirstName.
Similar Questions
Write a SELECT statement that returns the LastName and FirstName columns from the Instructors table.Return one row for each instructor that doesn’t have any courses in the Courses table. To do that, use a subquery introduced with the NOT EXISTS operator.Sort the result set by LastName and then by FirstName.
Below query can be replaced by which one of the following?Select name, course_idfrom instructor, teacheswhere instructor_ID= teaches_ID;Select course_id from instructor join teaches;Select name, course_id from instructor natural join teaches;Select name ,course_id from instructor;Select name,course_id from teaches,instructor where instructor_id=course_id;
Right replacement of below given Query is : SELECT Name, CourseId FROM Faculty, Teaches WHERE FacultyID= TeachesID;OptionsSelect Name, CourseId from Faculty natural join Teaches;Select Name, CourseId from Faculty;Select CourseId from Faculty join Teaches;Select Name,CourseId from Teaches,Faculty where FacultyId=CourseId;
Given two tables Teachers and Courses, which SQL query retrieves the list of teachers along with the names of the courses they are currently teaching?SELECT Teachers.teacher_name, Courses.course_name FROM Teachers LEFT JOIN Courses ON Teachers.teacher_id = Courses.teacher_id;SELECT Teachers.teacher_name, Courses.course_name FROM Teachers INNER JOIN Courses ON Teachers.teacher_id = Courses.teacher_id;SELECT Teachers.teacher_name, Courses.course_name FROM Teachers RIGHT JOIN Courses ON Teachers.teacher_id = Courses.teacher_id;SELECT Teachers.teacher_name, Courses.course_name FROM Teachers CROSS JOIN Courses WHERE Teachers.teacher_id = Courses.teacher_id;
Choose the correct answerWhich of the following command is used to display the departments of the instructor relation?OptionsSelect * from instructor ;Select * from instructor where Dept_name = Finance;Select dept_name from instructor;Select dept_name for instructor where Name=Jackson;
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.