add 3 files showing procedures

Author: John McGaughey

maintaining-sql-eddb.sql

@@ -62,3 +62,26 @@ delete major
 	where ID = (select id from Major where Description = 'General studies')
 
 select * from major;
+
+-- adding a student to a new class
+insert class (code, subject, section)
+	values
+	('ENG401', 'English', 401);
+
+select * from Class;
+select * from Student;
+
+select sc.StudentId, CONCAT(s.firstname, ' ', s.Lastname) as Name, c.code, c.subject, sc.ClassGradeValue as 'Grade', c.InstructorId as 'Instructor'
+	from StudentClass SC
+	JOIN Student S
+		ON S.Id = sc.StudentId
+	join Class c
+		on c.Id = sc.ClassId;
+
+insert StudentClass (StudentId, ClassId)
+	values
+	(
+	(select id from Student where Lastname = 'McGaughey' and Firstname = 'John'), 
+	(SELECT id from class where code = 'ENG401')
+	);
+

procedures1-whileLoop-eddb.sql

@@ -0,0 +1,21 @@
+-- procedures
+-- this creates the procedure counter
+create or alter procedure Counter
+	@max int = 5					-- do not declare variable in procedure BEFORE as
+as 
+-- BEGIN/END are statement blocks, code is run between statement blocks
+begin
+	declare @nbr int = 0;
+	declare @sum int = 0
+	while @nbr <= @max
+	begin
+		set @sum = @sum + square(@nbr);
+		print str(@nbr) + ' sum of the squares ' + trim(str(@sum));
+		set @nbr +=  + 1;
+	end
+	print 'Done...'
+end
+
+-- go will 'lock in the db', then can execute
+go 
+exec Counter @max = 10;				-- can pass values of variables during exec

procedures2-ShowCustomersBySalesRange-salesDB.sql

@@ -0,0 +1,13 @@
+-- procedures for
+create or alter procedure ShowCustomersBySalesRange
+	@lowsales decimal(10,2) = 0.0,
+	@highsales decimal(10,2) = 99999999.99
+as
+begin
+select *
+	from Customers
+	where Sales between @lowsales and @highsales
+	order by sales desc;
+end
+go
+exec ShowCustomersBySalesRange @lowsales = 50000;

procedures3-AddStudent-eddb.sql

@@ -0,0 +1,54 @@
+-- Procedure to add student to EdDb
+CREATE or ALTER procedure AddStudent
+	@firstname varchar(30) = null,
+	@lastname varchar(30) = null,
+	@statecode char(2) = 'OH',
+	@sat int = null,
+	@gpa decimal(4,2) = 0,
+	@majorcode varchar(4) = null
+as
+begin
+	-- make sure fields aren't null
+	if @firstname is null
+	begin
+		print 'First name is required';
+		return;
+	end
+	if @lastname is null
+	begin
+		print 'Last name is required';
+		return;
+	end
+	
+	-- find majorid using users code
+	declare @majorID int = 0;
+	select @majorID = id from Major where code = @majorcode;
+
+	-- check to see if major was found 
+	if @majorID = 0
+	begin
+		print 'Major not found';
+		return;
+	end
+
+	insert Student (Firstname, Lastname, StateCode, SAT, gpa, MajorId)
+		values (@firstname, @lastname, @statecode, @sat, @gpa, @majorid);
+
+	-- check to make sure 1 row was added
+	if @@ROWCOUNT != 1
+	begin
+		print 'Insert failed';
+		return;
+	end
+	
+	print 'Insert successful!';
+end
+go
+exec AddStudent @firstname = 'Jacob', @lastname = 'McGaughey', @statecode = 'KY', 
+				@sat = 1200, @gpa = 3.7, @majorcode = 'FIN';
+go
+select * 
+	from Student s
+	join major m
+		on s.MajorId = m.Id
+	order by s.id desc;