Having this information. Students Attribute Name Data Type StudentID char(11) FirstName varchar(20) LastName varchar(20) Gender char(1) DateofBirth date Courses Attribute Name Data Type CourseCode varchar(6) CourseName varchar(70) Level char(2) Credits int   Registration Attribute Name Data Type StudentID char(11) CourseCode varchar(6) Grade decimal(2, 1)   Write SQL code to:  1. How many courses are there on each level? 2. What is the average grade of courses that have been taken by the student with student ID 861103-2438?   3. Which students (studentID only) have the highest grade for the course ‘CS052’? 4.  Find the courses (course codes only) that have been taken by both the student 861103-2438 and the student 123456-0980.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Having this information.

Students
Attribute Name Data Type
StudentID char(11)
FirstName varchar(20)
LastName varchar(20)
Gender char(1)
DateofBirth date

Courses
Attribute Name Data Type
CourseCode varchar(6)
CourseName varchar(70)
Level char(2)
Credits int  

Registration
Attribute Name Data Type
StudentID char(11)
CourseCode varchar(6)
Grade decimal(2, 1)  

Write SQL code to: 

1. How many courses are there on each level?

2. What is the average grade of courses that have been taken by the student with
student ID 861103-2438?  

3. Which students (studentID only) have the highest grade for the course ‘CS052’?

4.  Find the courses (course codes only) that have been taken by both the student
861103-2438 and the student 123456-0980.  

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