O fixed

o.sql

@@ -0,0 +1,10 @@
+DROP VIEW IF EXISTS StudentsCredits;
+
+CREATE VIEW StudentsCredits AS
+SELECT Students.pNbr, sum(credits) as totalCredits
+FROM Students
+JOIN TakenCourses ON Students.pNbr = TakenCourses.pNbr
+JOIN Courses ON TakenCourses.courseCode = Courses.courseCode
+GROUP BY Students.pNbr;
+
+SELECT * FROM StudentsCredits ORDER BY totalCredits DESC;