NOTE: I'm having trouble (or Skillshare is) with formatting my text and tables - the Skillshare page layout was breaking and it was truncating my last table. And it doesn't seem to like double-spaces. So those triple slashes you see have been added to fix the problem. But the last table of data doesn't contain all the results.

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Here are my answers to the challenge questions. I had a harder time using JOINs than I did using WHERE statements; WHERE/AND/OR make more logical sense to me, I guess, and I had a hard time stringing JOIN statements together like WHERE/AND (and I don't know if it's possible or not).

If anyone sees any errors or has suggestions on how to improve these, I'd love to get your feedback!

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CHALLENGE QUESTION #1

Who were our best 10 customers in the last three months of the year?

I chose to use revenue and not number of orderes as my measure for "best customer." I made the assumption that "last the months of the year" meant last three months of last year, or October 1 - December 31, 2012.

Query:

SELECT customer_name, SUM(movie_price) AS revenue

FROM order_data AS od, customer_data AS cd, movie_data AS md

WHERE od.customer_id = cd.customer_id

AND od.movie_id = md.movie_id

AND datetime > '2012-10-01'

GROUP BY customer_name

ORDER BY revenue DESC

LIMIT 0, 10;

Data:

customer_name	revenue
George Holm	26.89
Larry Kozikowski	13.9
Amish Haffner	10.94
Sarah Curran	10.93
Natasha Simpson	9.97
Jan Smith	9.95
Jeff Southern	9.94
Rick Haffner	9.93
Lindsey Prentice	9.93
Rebecca Davis	9.91

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CHALLENGE QUESTION #2

What is the worst-selling movie on our website?

Logically, this one was pretty straight-forward.

Query:

SELECT movie_title, COUNT(*) as sales

FROM order_data AS od, movie_data AS md

WHERE od.movie_id = md.movie_id

GROUP BY movie_title

ORDER BY sales ASC

LIMIT 0,1;

Data:

movie_title	sales
Patton	32

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CHALLENGE QUESTION #3

Summarize the total number of purchases by price; do you think price makes a difference in order behavior?

Clearly, price does have an influence on purchase behavior - in particular at the upper and lower bounds.

Query:

SELECT movie_price, COUNT(*) as orders

FROM movie_data AS md, order_data AS od

WHERE od.movie_id = md.movie_id

GROUP BY movie_price

ORDER BY orders DESC;

Data:

movie_price	orders
0.99	2238
1.99	1399
3.99	1044
5.99	319

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CHALLENGE QUESTION #4

Summarize sales on our website by hour of the day, i.e., $X of movies were sold between 12 and 1AM, $Y between 1 and 2AM, and so on.

I thought it was interesting that there was very little variance based on time of day. Depending on whether your customers were more local or international, I would guess you would see more variance with real data. Also, I didn't recall HOUR(datetime) being covered in the class, but it worked similarly (as one would expect) as MONTH(datetime).

Query:

SELECT HOUR(datetime), SUM(movie_price)

FROM movie_data AS md, order_data AS od

WHERE md.movie_id = od.movie_id

GROUP BY HOUR(datetime);

Data:

HOUR(datetime)	SUM(movie_price)
0	518.800000000001
1	508.610000000001
2	466.930000000001
3	473.960000000001
4	335.140000000001
5	450.020000000001
6	505.640000000001
7	438.970000000001
8	481.830000000001
9	424.020000000001
10	448.080000000001
11	400.080000000001
12	511.800000000001
13	472.870000000001
14	473.870000000001
15	382.130000000001
16	435.900000000001
17	452.930000000001
18	462.020000000001
19	510.740000000001
20	454.930000000001
21	472.020000000001
22	488.850000000001
23	505.860000000001

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CHALLENGE QUESTION #5

What is the average price of a movie order across each month of the year?

I first ran a query grouped by YEAR(datetime) to see how many years were in the database. I'm not really sure why people are purchasing more expensive movies in Q1 of each year.

Query:

SELECT YEAR(datetime), MONTH(datetime), AVG(movie_price)

FROM movie_data AS md, order_data AS od

WHERE md.movie_id = od.movie_id

GROUP BY YEAR(datetime), MONTH(datetime);

Data:

YEAR(datetime)	MONTH(datetime)	AVG(movie_price)
2011	1	5.36950138504156
2011	2	3.36293729372938
2011	3	3.02804347826088
2011	4	2.79836236933799
2011	5	1.40042345276874
2011	6	1.94789473684211
2011	7	1.83527220630373
2011	8	1.10309523809524
2011	9	0.990000000000004
2011	10	1.07881578947369
2011	11	1.14037593984963
2011	12	1.92910256410257
2012	1	5.41857142857143
2012	2	3.28166666666667
2012	3	2.92548387096775
2012	4	2.82146067415731
2012	5	1.43943820224719
2012	6	1.87571428571429
2012	7	1.9
2012	8	1.07653846153846
2012	9	0.989999999999999
2012	10	1.06692307692308
2012	11	1.24471698113207
2012	12	2.01941176470589

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CHALLENGE QUESTION #6

How many times was each individual movie ordered in each month of each year? I.e., Amadeus was ordered twice in 1/2011, three times in 2/2011, etc.

I *think* this solution is correct. If anyone has a better solution, please let me know!

Query:

SELECT movie_title, YEAR(datetime), MONTH(datetime), COUNT(*)

FROM order_data AS od, movie_data AS md

WHERE od.movie_id = md.movie_id

GROUP BY movie_title, YEAR(datetime), MONTH(datetime)

ORDER BY movie_title;

Data:

movie_title	YEAR(datetime)	MONTH(datetime)	*COUNT()**
A Beautiful Mind	2011	5	120
A Beautiful Mind	2012	5	36
Amadeus	2011	10	73
Amadeus	2012	10	24
American Beauty	2011	5	69
American Beauty	2011	6	30
American Beauty	2011	7	1
American Beauty	2012	5	15
American Beauty	2012	6	16
Annie Hall	2011	11	3
Annie Hall	2011	12	36
Annie Hall	2012	11	8
Annie Hall	2012	12	17
Braveheart	2011	7	92
Braveheart	2012	7	29
Chariots of Fire	2011	11	61
Chariots of Fire	2011	12	2
Chariots of Fire	2012	11	14
Chariots of Fire	2012	12	1
Chicago	2011	4	108
Chicago	2011	5	3
Chicago	2012	4	32
Chicago	2012	5	1
Crash	2011	3	104
Crash	2012	3	41
Dances with Wolves	2011	8	108
Dances with Wolves	2012	8	31
Driving Miss Daisy	2011	8	7
Driving Miss Daisy	2011	9	86
Driving Miss Daisy	2011	10	3
Driving Miss Daisy	2012	8	2
Driving Miss Daisy	2012	9	28
Forrest Gump	2011	7	117
Forrest Gump	2012	7	35
Gandhi	2011	10	27
Gandhi	2011	11	37
Gandhi	2011	12	2
Gandhi	2012	10	8
Gandhi	2012	11	19
Gladiator	2011	5	109
Gladiator	2012	5	36
Kramer vs. Kramer	2011	11	52
Kramer vs. Kramer	2011	12	2
Kramer vs. Kramer	2012	11	25
Kramer vs. Kramer	2012	12	2
LOTR: Return of the King	2011	4	116
LOTR: Return of the King	2011	5	4
LOTR: Return of the King	2012	4	37
LOTR: Return of the King	2012	5	1
Million Dollar Baby	2011	3	49
Million Dollar Baby	2011	4	63
Million Dollar Baby	2011	5	2
Million Dollar Baby	2012	3	25
Million Dollar Baby	2012	4	20
No Country For Old Men	2011	2	95
No Country For Old Men	2011	3	24
No Country For Old Men	2012	2	34
One Flew Over the Cuckoo's Nest	2011	12	48
One Flew Over the Cuckoo's Nest	2012	12	24
Ordinary People	2011	11	60
Ordinary People	2012	11	23
Out of Africa	2011	10	77
Out of Africa	2012	10	27
Patton	2011	12	23
Patton	2012	12	9
Platoon	2011	9	28
Platoon	2011	10	44
Platoon	2012	9	10
Platoon	2012	10	21
Rain Man	2011	9	83
Rain Man	2011	10	6
Rain Man	2012	9	26
Rain Man	2012	10	1
Rocky	2011	12	45
Rocky	2012	12	24
Schindlers List	2011	7	83
Schindlers List	2011	8	38
Schindlers List	2012	7	24
Schindlers List	2012	8	9
Shakespeare in Love	2011	6	119
Shakespeare in Love	2011	7	4
Shakespeare in Love	2012	6	40
Slumdog Millionaire	2011	2	125
Slumdog Millionaire	2011	3	6
Slumdog Millionaire	2012	2	34
Slumdog Millionaire	2012	3	1
Terms of Endearment	2011	10	72
Terms of Endearment	2012	10	22
The Artist	2011	1	126
The Artist	2012	1	41
The Deer Hunter	2011	11	53
The Deer Hunter	2011	12	2
The Deer Hunter	2012	11	17
The Deer Hunter	2012	12	1
The Departed	2011	3	172
The Departed	2012	3	55
The English Patient	2011	6	45
The English Patient	2011	7	51
The English Patient	2012	6	18
The English Patient	2012	7	11

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CHALLENGE QUESTION #7

Show off! What is the most interesting insight you can draw from the database?

I thought it would be interesting to see which customers purchased the higher priced movies and which purchased only the lower priced movies. In the real world, you could use this data to filter recommendations by price, or suggest higher-priced movies to customers who were less price sensitive. Unfortunately, the data shows that customers pretty much behave the same when it comes to pricing. My guess is that there would be more variance in a real data set of customer behavior.

Here was my challenge: Summarize the # of orders by price for each customer

You could throw this data in a pivot table and get a better summary.

Query:

SELECT customer_name, movie_price, COUNT(movie_title)

FROM order_data AS od, movie_data AS md, customer_data AS cd

WHERE md.movie_id = od.movie_id

AND cd.customer_id = od.customer_id

GROUP BY customer_name, movie_price

ORDER BY customer_name, movie_price;

Data:

Note: This is just a sample of the data, because Skillshare is choking on the entire table...

customer_name	movie_price	COUNT(movie_title)
Alicia Fisher	0.99	28
Alicia Fisher	1.99	16
Alicia Fisher	3.99	11
Alicia Fisher	5.99	9
Alicia Smith	0.99	14
Alicia Smith	1.99	17
Alicia Smith	3.99	6
Alicia Smith	5.99	7
Alicia Weller	0.99	25
Alicia Weller	1.99	12
Alicia Weller	3.99	13
Alicia Weller	5.99	1
Amish Fisher	0.99	35
Amish Fisher	1.99	19
Amish Fisher	3.99	17
Amish Fisher	5.99	5
Amish Haffner	0.99	19
Amish Haffner	1.99	15
Amish Haffner	3.99	14
Amish Haffner	5.99	1
Amish Heitzmann	0.99	21
Amish Heitzmann	1.99	9
Amish Heitzmann	3.99	13
Amish Heitzmann	5.99	4
Amish Prentice	0.99	21
Amish Prentice	1.99	12
Amish Prentice	3.99	9
Amish Prentice	5.99	3
Carol Haffner	0.99	26
Carol Haffner	1.99	16
Carol Haffner	3.99	8
Carol Haffner	5.99	5
Carol Holm	0.99	20
Carol Holm	1.99	16
Carol Holm	3.99	16
Carol Holm	5.99	4
Chris Chen	0.99	22
Chris Chen	1.99	14
Chris Chen	3.99	6
Chris Chen	5.99	2

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