SQL server 2017 ON DELETE CASCADE question - sql

Question

Below is the code for the entire script. the only issue i have is with the FK below (see lines with -- in front) to remove it. if I add that I get an error using a DELETE, if I only apply the 4 constraints instead of 5 I can delete from the Artist table and it deletes from the other 3 as it should. but when I add PersonalInfo with an ON DELETE CASCADE suddenly I get an error, why? I plan to remove AlbumID from all tables so that they all rely on ArtistID to be identified. Allowing me to use the same column for FK as PK.
CREATE TABLE Artists
( ArtistName varchar(20) NOT NULL, ArtistID varchar(20) NOT NULL, NumberOfAlbumTitles varchar(10) NOT NULL, AlbumID varchar(20) NOT NULL,
PRIMARY KEY (ArtistID))
GO
CREATE TABLE Sales
( AlbumID varchar(20) NOT NULL, CopiesSoldYTD varchar(20) NOT NULL, ArtistID varchar(20) NOT NULL, SalesTotal varchar(20) NOT NULL,
PRIMARY KEY (AlbumID))
GO
CREATE TABLE Production
( AlbumID varchar(20), Copies varchar(20) NOT NULL, UnitPrice varchar(10) NOT NULL, AlbumTitle varchar(20) NOT NULL, ArtistID varchar(20) NOT NULL,
PRIMARY KEY (ArtistID))
GO
CREATE TABLE PersonalInfo
( FirstName varchar(20) NOT NULL, LastName varchar(30) NOT NULL, HomeAddress varchar(30) NOT NULL, PhoneNumber varchar(10) NOT NULL, ArtistID varchar(20) NOT NULL,
PRIMARY KEY (ArtistID))
GO
CREATE TABLE PersonalInfo2
( City varchar(20) NOT NULL, LabelName varchar(20), PostalZip varchar(6) NOT NULL, Region varchar(30) NOT NULL, ArtistID varchar(20) NOT NULL,
PRIMARY KEY (ArtistID))
GO
INSERT INTO Artists
VALUES ('Mr Roberts', 1, 4, 10),
('MC Boogie', 2, 3, 11),
('Singin Sam', 3, 1, 12),
('Avenger', 4, 2, 13)
GO
INSERT INTO Sales
VALUES (10, 232 , 1, 2320),
(11, 151, 2, 1510),
(12, 129, 3, 1290),
(13, 487, 4, 4870)
GO
INSERT INTO Production
VALUES (10 , 500 , 10, 'Roberts 1', 1),
(11, 700, 10, 'Time To Boogie', 2),
(12, 250, 10, ' Dance Dance Dance', 3),
(13, 1000, 10, 'The Revenge Of...', 4)
GO
INSERT INTO PersonalInfo
VALUES ('Brad', 'Roberts' , ' 126 Somewhere Lane', 2048888888, 1),
('Doug', 'Boogie', '234 East bay', 9078789090, 2),
('Raymond', 'Disco', ' 123 Dancing Queen Blvd', 3038761234, 3),
('Ryan', 'Apple', '66 Berkshire Bay', 4549091212, 4)
GO
INSERT INTO PersonalInfo2
VALUES ('Winnipeg', 'Ready Records', 'R2E9N8', 1, 1),
('Calgary','Set Records', 'R3J1M7', 2, 2),
('Texas', 'Go Records', '56555', 5, 3),
('London', 'Canadian Recordings','98887', 4, 4)
GO
ALTER TABLE Sales
ADD FOREIGN KEY (ArtistID) REFERENCES Artists(ArtistID)
ON DELETE CASCADE
GO
--ALTER TABLE PersonalInfo
--ADD FOREIGN KEY (ArtistID) REFERENCES Artists(ArtistID)
--GO
ALTER TABLE PersonalInfo2
ADD FOREIGN KEY (ArtistID) REFERENCES Artists(ArtistID)
ON DELETE CASCADE
GO
ALTER TABLE Sales
ADD FOREIGN KEY (ArtistID) REFERENCES Artists(ArtistID)
GO
ALTER TABLE Production
ADD FOREIGN KEY (ArtistID) REFERENCES Artists(ArtistID)
ON DELETE CASCADE
GO
UPDATE Artists
SET ArtistName = 'Mr. Roberts'
WHERE ArtistID = 1
GO
UPDATE Production
SET Copies = 589, UnitPrice = 12
WHERE AlbumID = 10
GO
UPDATE PersonalInfo
SET HomeAddress = '345 Pritchard Rd', PhoneNumber = 2042341234
WHERE ArtistID = 1
GO
CREATE INDEX index1
ON dbo.Artists (ArtistID, AlbumID);
GO
CREATE INDEX index3
ON Sales (AlbumID, ArtistID);
GO
CREATE INDEX index4
ON Production (AlbumID, ArtistID);
GO
CREATE INDEX index5
ON PersonalInfo2 (City, ArtistID);
GO
CREATE INDEX index6
ON PersonalInfo (ArtistID);
GO
CREATE INDEX index7
ON Artists (ArtistName, NumberOfAlbumTitles);
GO
CREATE INDEX index8
ON Production (ArtistID, AlbumID, Copies, UnitPrice);
GO
CREATE INDEX index9
ON Artists (AlbumID);
GO
CREATE INDEX index11
ON Sales (ArtistID);
GO
CREATE INDEX index12
ON Production (ArtistID)
GO
CREATE INDEX index13
ON PersonalInfo2 (ArtistID);
GO
CREATE VIEW view1 AS
SELECT FirstName, LastName, ArtistName, PhoneNumber, CopiesSoldYTD, SalesTotal
FROM PersonalInfo
INNER JOIN Sales
ON PersonalInfo.ArtistID = Sales.ArtistID
INNER JOIN Artists
ON Sales.ArtistID = Artists.ArtistID
GO
CREATE PROCEDURE Proc1
AS
SELECT FirstName, LastName, Artists.ArtistName, NumberOfAlbumTitles, Artists.ArtistID, LabelName, PhoneNumber, City, UnitPrice, CopiesSoldYTD, SalesTotal
FROM Artists
LEFT JOIN PersonalInfo
ON Artists.ArtistID = PersonalInfo.ArtistID
LEFT JOIN PersonalInfo2
ON PersonalInfo.ArtistID = PersonalInfo2.ArtistID
INNER JOIN Production
ON PersonalInfo2.ArtistID = Production.ArtistID
INNER JOIN Sales
ON Production.ArtistID = Sales.ArtistID
GO
CREATE PROCEDURE dbo.FinalProjectErrorHandling2
AS
BEGIN TRY
SELECT CopiesSoldYTD, SalesTotal
FROM Sales
GROUP BY SalesTotal, CopiesSoldYTD
HAVING CopiesSoldYTD > 200
END TRY
BEGIN CATCH
WHILE(ERROR_NUMBER() > 0 )
RAISERROR ('the error was handled',0,1) WITH NOWAIT
SELECT
ERROR_MESSAGE() AS ErrorMessage
END CATCH
GO

Answer 1

Because you are missing "ON DELETE CASCADE" here
--ALTER TABLE PersonalInfo
--ADD FOREIGN KEY (ArtistID) REFERENCES Artists(ArtistID) <---- Missing on delete cascade
--GO
Once you add that
ALTER TABLE PersonalInfo
ADD FOREIGN KEY (ArtistID) REFERENCES Artists(ArtistID)
ON DELETE CASCADE
GO
it works as required