Consider the relational schema below: Students(sid: integer, sname: string, major: string) Courses(cid: string, cname: string) Enrollment(sid: integer, cid: string, grade: real) Write a tuple relational calculus expression that satisfies this query? Find the distinct names of all students who major in either "Math" or "Economics" who score less than 60% in either course 91.574 or in course 14.501 (using cid)

Consider the following database table named water_schemes: water- schemes scheme_no district_name capacity Ajmer 1 20 1 Bikaner 10 2 Bikaner 10 3 Bikaner 20 1 Churu 10 Churu 20 1 Dungargarh 10 The number of tuples returned by the following SQL query is with total(name, capacity) as select district_name, sum(capacity) from water_schemes group by district_name with total_avg(capacity) as select avg(capacity) from total select name from total, total_avg where total.capacity 2 total_avg.capacity

please help me to write the expression for these in access. please.

I NEED HELP WITH THIS QUESTION FOR MY DATABASE MANAGEMENT CLASS FOR SQL DEVELOPER 5. Now compute Average GPA in each class. Display class_code, Class_GPA. Assume all courses are 3 credit courses. A general formula for GPA would be sum(gradepoints x Hrs)/sum(Hrs). Here you can just take an average of gradepoints as the credit hours are same for all courses.