What is wrong with my queries? - sql

Question

All the code is correct but the queries (which are at the very bottom) don't seem to run. I checked on w3schools.com for more information, but it seems like there's nothing wrong with my code.
Can anyone take a look and explain?
--Drop tables--
DROP TABLE Job;
DROP TABLE Employee;
DROP TABLE Purchase;
DROP TABLE SoccerBall;
DROP TABLE Client;
--Create tables--
CREATE TABLE Client
(
ClientId INT NOT NULL,
ClientName VARCHAR(20) NOT NULL,
Street VARCHAR(20) NOT NULL,
City VARCHAR(20) NOT NULL,
ZipCode VARCHAR(5) NOT NULL,
Phone VARCHAR(15) NULL,
EmailAddr VARCHAR(50) NULL,
PRIMARY KEY(ClientId)
);
CREATE TABLE SoccerBall
(
BallId INT NOT NULL,
BallSize NUMBER(1) NOT NULL,
Color VARCHAR(20) NOT NULL,
Material VARCHAR(20) NOT NULL,
PRIMARY KEY(BallId)
);
CREATE TABLE Purchase
(
PurchaseId INT NOT NULL,
ClientId INT NOT NULL,
BallId INT NOT NULL,
PurchaseDate DATE NOT NULL,
PRIMARY KEY (PurchaseId),
FOREIGN KEY (ClientId) REFERENCES Client (ClientId),
FOREIGN KEY (BallId) REFERENCES SoccerBall (BallId)
);
CREATE TABLE Employee
(
EmployeeId INT NOT NULL,
EmployeeName VARCHAR(50) NOT NULL,
PRIMARY KEY (EmployeeId)
);
CREATE TABLE Job
(
JobId INT NOT NULL,
PurchaseId INT NOT NULL,
EmployeeId INT NOT NULL,
AssignDate DATE NOT NULL,
PRIMARY KEY (JobId),
FOREIGN KEY (EmployeeId) REFERENCES Employee (EmployeeId)
);
--Insert data--
INSERT INTO Client VALUES
(1, 'Adidas', '123 Adidas Lane', 'Adida', '22209', '1-800-555-1987', 'corporate#adidas.com');
INSERT INTO Client VALUES
(2, 'Nike', '234 Nike Drive', 'Nikail', '22182', '1-888-555-9876', 'corporate#nike.com');
INSERT INTO Client VALUES
(3, 'Puma', '345 Puma Blvd', 'Puma City', '20912', '1-800-555-6247', 'corporate#puma.com');
INSERT INTO Client VALUES
(4, 'Reebok', '456 Reebok Cove', 'Old Reebok', '20902', '1-800-555-1000', 'corporate#reebok.com');
INSERT INTO Client VALUES
(5, 'Vans', '567 Vans Lane', 'Vancouver', '20725', '1-900-666-2000', 'corporate#vans.com');
INSERT INTO Client VALUES
(6, 'Jordan', '234 Nike Drive', 'Nikail', '22182', '1-888-555-8765', 'corporate#jordan.com');
INSERT INTO Client VALUES
(7, 'Diadora', '345 Puma Blvd', 'Puma City', '20912', '1-800-555-4126', 'corporate#diadora.com');
INSERT INTO SoccerBall VALUES
(11, 1, 'blue', 'felt');
INSERT INTO SoccerBall VALUES
(12, 3, 'red', 'leather');
INSERT INTO SoccerBall VALUES
(13, 3, 'yellow', 'faux leather');
INSERT INTO SoccerBall VALUES
(14, 5, 'black', 'leather');
INSERT INTO SoccerBall VALUES
(15, 4, 'white', 'faux leather');
INSERT INTO SoccerBall VALUES
(16, 3, 'purple', 'rubber');
INSERT INTO SoccerBall VALUES
(17, 1, 'blue', 'faux leather');
INSERT INTO Purchase VALUES
(21, 2, 11, DATE '2013-01-01');
INSERT INTO Purchase VALUES
(22, 4, 12, DATE '2012-03-24');
INSERT INTO Purchase VALUES
(23, 7, 15, DATE '2013-05-01');
INSERT INTO Purchase VALUES
(24, 5, 13, DATE '2005-12-30');
INSERT INTO Purchase VALUES
(25, 6, 16, DATE '1999-01-23');
INSERT INTO Employee VALUES
(111, 'Vivin Viswanathan');
INSERT INTO Employee VALUES
(222, 'Andy Edwards');
INSERT INTO Employee VALUES
(333, 'Frank Hellwig');
INSERT INTO Employee VALUES
(444, 'Vandana Janeja');
INSERT INTO Job VALUES
(1111, 21, 111, DATE '2013-01-02');
INSERT INTO Job VALUES
(5555, 22, 111, DATE '2012-03-26');
INSERT INTO Job VALUES
(2222, 23, 222, DATE '2013-05-08');
INSERT INTO Job VALUES
(3333, 24, 222, DATE '2006-01-02');
INSERT INTO Job VALUES
(4444, 25, 111, DATE '1999-01-30');
--Queries--
--Query 1--Show me the information in the database
SELECT * FROM Client;
SELECT * FROM SoccerBall;
SELECT * FROM Purchase;
SELECT * FROM Employee;
SELECT * FROM Job;
--"Forgot" Quantity Attribute. Adding that--
ALTER TABLE Purchase ADD Quantity NUMBER(5);
UPDATE Purchase SET Quantity = '12000' WHERE ClientId = '1';
UPDATE Purchase SET Quantity = '2492' WHERE ClientId = '2';
UPDATE Purchase SET Quantity = '94203' WHERE ClientId = '3';
UPDATE Purchase SET Quantity = '4394' WHERE ClientId = '4';
UPDATE Purchase SET Quantity = '0' WHERE ClientId = '5';
UPDATE Purchase SET Quantity = '4832' WHERE ClientId = '6';
UPDATE Purchase SET Quantity = '10002' WHERE ClientId = '7';
SELECT * FROM Purchase;
--Queries Continued--
--Query 2--I want to know how many clients we have
SELECT COUNT(*) FROM Client;
--Query 3--Which client ordered the most soccer balls?***********
SELECT MAX(Quantity), ClientName
FROM Purchase P, Client C
WHERE P.ClientId = C.ClientId;
--Query 4--How many projects does each employe have?***********
SELECT EmployeeId COUNT(*)
FROM Job
GROUP BY EmployeeId;
--Query 5--First purchases, first served. Show me the order of the purchases by date***********
SELECT ClientName, PurchaseDate
FROM Purchase P, Client C
WHERE P.ClientId = C.ClientId AND ORDER BY PurchaseDate;
--Query 6--Show me what kind of balls were purchased***********
SELECT B.BallId, B.BallSize, B.Color, B.Material
FROM SoccerBall B, Purchase P, Client C
WHERE P.ClientId = C.ClientId AND P.BallId = B.BallId AND C.ClientId = 1;
--Query 7--Show me who purchased what balls**************
SELECT B.BallId, B.BallSize, B.Color, B.Material, C.ClientId, ClientName
FROM SoccerBall B, Purchase P, Client C
WHERE P.ClientId = C.ClientId AND P.BallId = B.BallId GROUP BY ClientName;
Thanks so much!

Answer 1

You have several issues with your queries.
Query 3 is missing a GROUP BY with the aggregate function:
SELECT MAX(Quantity), ClientName
FROM Purchase P
INNER JOIN Client C
ON P.ClientId = C.ClientId
GROUP BY ClientName;
Query 4 is missing a comma between the columns employeeId and count(*):
SELECT EmployeeId, COUNT(*)
FROM Job
GROUP BY EmployeeId;
Query 5 has an errant AND before the ORDER BY:
SELECT ClientName, PurchaseDate
FROM Purchase P
INNER JOIN Client C
ON P.ClientId = C.ClientId
ORDER BY PurchaseDate;
Query 6 is you want all of the balls purchased, I don't think you want a filter on ClientId:
SELECT B.BallId, B.BallSize, B.Color, B.Material
FROM SoccerBall B
INNER JOIN Purchase P
ON P.BallId = B.BallId
INNER JOIN Client C
ON P.ClientId = C.ClientId;
Query 7 is using a GROUP BY on one column only which will not work correctly:
SELECT B.BallId, B.BallSize, B.Color, B.Material, C.ClientId, ClientName
FROM SoccerBall B
INNER JOIN Purchase P
ON P.BallId = B.BallId
INNER JOIN Client C
ON P.ClientId = C.ClientId;
See SQL Fiddle with Demo.
As a side note, you will notice that I updated the queries to use INNER JOIN syntax instead of commas between the tables and the joins in the WHERE clause.

Answer 2

This one works. Try it out.
' --Drop tables--
DROP TABLE job;
DROP TABLE employee;
DROP TABLE purchase;
DROP TABLE soccerball;
DROP TABLE client;
--Create tables--
CREATE TABLE client
(
clientid INT NOT NULL IDENTITY(1, 1),
clientname VARCHAR(20) NOT NULL,
street VARCHAR(20) NOT NULL,
city VARCHAR(20) NOT NULL,
zipcode VARCHAR(5) NOT NULL,
phone VARCHAR(15) NULL,
emailaddr VARCHAR(50) NULL,
PRIMARY KEY(clientid)
);
CREATE TABLE soccerball
(
ballid INT NOT NULL,
ballsize NUMERIC(1) NOT NULL,
color VARCHAR(20) NOT NULL,
material VARCHAR(20) NOT NULL,
PRIMARY KEY(ballid)
);
CREATE TABLE purchase
(
purchaseid INT NOT NULL,
clientid INT NOT NULL,
ballid INT NOT NULL,
purchasedate DATETIME NOT NULL,
PRIMARY KEY (purchaseid),
FOREIGN KEY (clientid) REFERENCES client (clientid),
FOREIGN KEY (ballid) REFERENCES soccerball (ballid)
);
CREATE TABLE employee
(
employeeid INT NOT NULL,
employeename VARCHAR(50) NOT NULL,
PRIMARY KEY (employeeid)
);
CREATE TABLE job
(
jobid INT NOT NULL,
purchaseid INT NOT NULL,
employeeid INT NOT NULL,
assigndate DATETIME NOT NULL,
PRIMARY KEY (jobid),
FOREIGN KEY (employeeid) REFERENCES employee (employeeid)
)
--Insert data--
INSERT INTO dbo.client
(clientname,
street,
city,
zipcode,
phone,
emailaddr)
VALUES ( 'Adidas',
'123 Adidas Lane',
'Adida',
'22209',
'1-800-555-1987',
'corporate#adidas.com')
INSERT INTO client
(clientname,
street,
city,
zipcode,
phone,
emailaddr)
VALUES ('Nike',
'234 Nike Drive',
'Nikail',
'22182',
'1-888-555-9876',
'corporate#nike.com')
INSERT INTO client
VALUES ( 'Puma',
'345 Puma Blvd',
'Puma City',
'20912',
'1-800-555-6247',
'corporate#puma.com')
INSERT INTO client
VALUES ( 'Reebok',
'456 Reebok Cove',
'Old Reebok',
'20902',
'1-800-555-1000',
'corporate#reebok.com')
INSERT INTO client
VALUES ( 'Vans',
'567 Vans Lane',
'Vancouver',
'20725',
'1-900-666-2000',
'corporate#vans.com')
INSERT INTO client
VALUES ( 'Jordan',
'234 Nike Drive',
'Nikail',
'22182',
'1-888-555-8765',
'corporate#jordan.com')
INSERT INTO client
VALUES ( 'Diadora',
'345 Puma Blvd',
'Puma City',
'20912',
'1-800-555-4126',
'corporate#diadora.com')
INSERT INTO soccerball
VALUES (11,
1,
'blue',
'felt');
INSERT INTO soccerball
VALUES (12,
3,
'red',
'leather');
INSERT INTO soccerball
VALUES (13,
3,
'yellow',
'faux leather');
INSERT INTO soccerball
VALUES (14,
5,
'black',
'leather');
INSERT INTO soccerball
VALUES (15,
4,
'white',
'faux leather');
INSERT INTO soccerball
VALUES (16,
3,
'purple',
'rubber');
INSERT INTO soccerball
VALUES (17,
1,
'blue',
'faux leather');
INSERT INTO purchase
VALUES (21,
2,
11,
'2013-01-01');
INSERT INTO purchase
VALUES (22,
4,
12,
'2012-03-24');
INSERT INTO purchase
VALUES (23,
7,
15,
'2013-05-01');
INSERT INTO purchase
VALUES (24,
5,
13,
'2005-12-30');
INSERT INTO purchase
VALUES (25,
6,
16,
'1999-01-23');
INSERT INTO employee
VALUES (111,
'Vivin Viswanathan');
INSERT INTO employee
VALUES (222,
'Andy Edwards');
INSERT INTO employee
VALUES (333,
'Frank Hellwig');
INSERT INTO employee
VALUES (444,
'Vandana Janeja');
INSERT INTO job
VALUES (1111,
21,
111,
'2013-01-02');
INSERT INTO job
VALUES (5555,
22,
111,
'2012-03-26');
INSERT INTO job
VALUES (2222,
23,
222,
'2013-05-08');
INSERT INTO job
VALUES (3333,
24,
222,
'2006-01-02');
INSERT INTO job
VALUES (4444,
25,
111,
'1999-01-30');
--Queries--
--Query 1--Show me the information in the database
SELECT *
FROM client;
SELECT *
FROM soccerball;
SELECT *
FROM purchase;
SELECT *
FROM employee;
SELECT *
FROM job;
--"Forgot" Quantity Attribute. Adding that--
ALTER TABLE purchase
ADD quantity NUMERIC;
UPDATE purchase
SET quantity = '12000'
WHERE clientid = '1';
UPDATE purchase
SET quantity = '2492'
WHERE clientid = '2';
UPDATE purchase
SET quantity = '94203'
WHERE clientid = '3';
UPDATE purchase
SET quantity = '4394'
WHERE clientid = '4';
UPDATE purchase
SET quantity = '0'
WHERE clientid = '5';
UPDATE purchase
SET quantity = '4832'
WHERE clientid = '6';
UPDATE purchase
SET quantity = '10002'
WHERE clientid = '7';
SELECT *
FROM purchase;
--Queries Continued--
--Query 2--I want to know how many clients we have
SELECT Count(*)
FROM client;
--Query 3--Which client ordered the most soccer balls?***********
SELECT Max(quantity),
clientname
FROM purchase P,
client C
WHERE P.clientid = C.clientid
GROUP BY clientname
--Query 4--How many projects does each employe have?***********
SELECT Count(*)
FROM job
--Query 5--First purchases, first served. Show me the order of the purchases by date***********
SELECT clientname,
purchasedate
FROM purchase P,
client C
WHERE P.clientid = C.clientid
ORDER BY purchasedate;
--Query 6--Show me what kind of balls were purchased***********
SELECT B.ballid,
B.ballsize,
B.color,
B.material
FROM soccerball B,
purchase P,
client C
WHERE P.clientid = C.clientid
AND P.ballid = B.ballid
AND C.clientid = 1;
--Query 7--Show me who purchased what balls**************
SELECT B.ballid,
B.ballsize,
B.color,
B.material,
C.clientid,
clientname
FROM soccerball B,
purchase P,
client C
WHERE P.clientid = C.clientid
AND P.ballid = B.ballid
GROUP BY B.ballid,
B.ballsize,
B.color,
B.material,
C.clientid,
clientname'