ZipCodeCore · tnguyen1912 · Jul 29, 2021
diff --git a/.DS_Store b/.DS_Store
diff --git a/answers/exercise1.sql b/answers/exercise1.sql
@@ -0,0 +1,4 @@
+SELECT * 
+FROM Enrolments
+LEFT JOIN Students 
+ON Enrolments.StudentID=Students.StudentID;
diff --git a/answers/exercise2.sql b/answers/exercise2.sql
@@ -0,0 +1,4 @@
+SELECT * 
+FROM Enrolments
+INNER JOIN Students
+ON Enrolments.StudentID=Students.StudentID
diff --git a/answers/exercise3.sql b/answers/exercise3.sql
@@ -0,0 +1,4 @@
+SELECT * 
+FROM Enrolments 
+RIGHT JOIN Students
+ON Enrolments.StudentID=Students.StudentID;
diff --git a/answers/exercise4.sql b/answers/exercise4.sql
@@ -0,0 +1,3 @@
+SELECT COUNT (StudentID) AS NumberOfStudents, Country
+FROM Students
+GROUP BY Country;
diff --git a/answers/exercise5.sql b/answers/exercise5.sql
@@ -0,0 +1,4 @@
+SELECT COUNT (StudentID) AS NumberOfStudents, Country
+FROM Students
+GROUP BY Country
+ORDER BY COUNT (StudentID) DESC;
diff --git a/answers/exercise6.sql b/answers/exercise6.sql
@@ -0,0 +1,5 @@
+SELECT COUNT (StudentID) AS NumberOfStudents, Country 
+FROM Students 
+GROUP BY Country
+HAVING COUNT (StudentID) > 10
+ORDER BY COUNT(StudentID) DESC;