finito

answers/exercise1.sql

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+USE myNewDb;
+CREATE TABLE Enrollments(
+StudentId int,
+StudentName VARCHAR(255));
+CREATE TABLE Learners(
+StudentId int,
+StudentName VARCHAR(255));
+INSERT INTO Enrollments(
+StudentId,
+StudentName)
+VALUES(
+4,
+'Mike');
+SELECT * FROM Enrollments;
+INSERT INTO Learners(
+StudentId,
+StudentName)
+VALUES(
+7,
+'Takeoff');
+SELECT * FROM Enrollments
+RIGHT JOIN Learners
+ON Enrollments.StudentId
+= Learners.StudentId;

answers/exercise2.sql

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+SELECT * FROM Enrollments
+INNER JOIN Learners
+ON Enrollments.StudentId
+= Learners.StudentId;

answers/exercise3.sql

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+SELECT * FROM Enrollments
+RIGHT JOIN Learners
+ON Enrollments.StudentId
+= Learners.StudentId;

answers/exercise4.sql

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+SELECT COUNT( * ), Country 
+FROM Students 
+GROUP BY Country;

answers/exercise5.sql

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+SELECT COUNT( * ), Country 
+FROM Students 
+GROUP BY Country
+ORDER BY COUNT(*) DESC;

answers/exercise6.sql

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+SELECT COUNT( * ), Country 
+FROM Students 
+GROUP BY Country
+HAVING COUNT(*) > 10
+ORDER BY COUNT(*);