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# CS 561 Programming Assignment 1 Solved

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## Objectives

In this assignment, you will express “complex” OLAP queries in SQL. The key point of the
exercise is to observe the complexity of expressing the type of such queries despite relatively
simple ideas of the queries themselves. Your mission (in addition to writing the SQL queries) is to
consider the reasons for the complexity of the expression of these queries.

## Description

Generate 5 separate reports based on the following queries (one report for query #1, one for
query #2, one for query #3, one for query #4 and another for query #5):

1. For each customer, compute the minimum and maximum sales quantities along with the
corresponding products (purchased), dates (i.e., dates of those minimum and maximum
sales quantities) and the states in which the sale transactions took place. If there are >1
occurrences of the min or max, display all.
For the same customer, compute the average sales quantity.

2. For each of the 12 months (regardless of the year), find the most “productive” and least
“productive” days (those days with most and least total sales quantities) and the
corresponding total sales quantities (i.e., SUMs).

3. For each product, find the “most favorable” month (when most amount of the product was
sold) and the “least favorable” month (when the least amount of the product was sold).

4. Show for each customer and product combination, the average sales quantities for 4
quarters, Q1, Q2, Q3 and Q4 (in four separate columns) – Q1 being the first 3 months of
the year (Jan, Feb & Mar), Q2 the next 3 months (Apr, May & Jun), and so on – ignore the
YEAR component of the dates (i.e., 3/11/2001 is considered the same date as 3/11/2002,
etc.). Also compute the average for the “whole” year (again ignoring the YEAR
component, meaning simply compute AVG) along with the total quantities (SUM) and the
counts (COUNT).

5. For each combination of customer and product, output the maximum sales quantities for
NJ, NY and CT in 3 separate columns. Like the first report, display the corresponding
dates (i.e., dates of those corresponding maximum sales quantities). Furthermore, show
the output only if maximum for NY is greater than NJ or CT.

The following is a sample output – quantities displayed are for illustration only (not the actual
values). For dates (e.g., MAX_DATE, MIN_DATE), you can display ‘month’, ‘day’ and ‘year’
as 3 separate columns – i.e., you don’t need to concatenate them into MM/DD/YYYY format.

### Report #1:

CUSTOMER MIN_Q MIN_PROD MIN_DATE ST MAX_Q MAX_PROD MAX_DATE ST AVG_Q
======== ===== ======== ========== == ===== ======== ========== == =====

Bloom 12 Pepsi 01/01/2006 NJ 2893 Apple 09/25/2001 NY 1435
Sam 1 Milk 02/15/2002 NJ 259 Banana 03/23/2004 CT 56
Emily 2 Bread 07/01/2005 NY 3087 Milk 02/02/2001 NJ 1512
. . . .
Report #2:

CS 561 Page 2 of 2
Database Management Systems I

MONTH MOST_PROFIT_DAY MOST_PROFIT_TOTAL_Q LEAST_PROFIT_DAY LEAST_PROFIT_TOTAL_Q
===== =============== =================== ================ ====================
1 12 497214 31 55526
2 23 1874794 15 23126
3 4 974531 2 19958
. . . .
Report #3:
PRODUCT MOST_FAV_MO LEAST_FAV_MO
======= =========== ============
Egg 4 12
Apple 1 11
Banana 3 2
. . . .
Report #4:
CUSTOMER PRODUCT Q1_AVG Q2_AVG Q3_AVG Q4_AVG AVERAGE TOTAL COUNT
======== ======= ====== ====== ====== ====== ======= ===== =====
Sam Pepsi 1923 4241 2383 1325 2988 38848 13
Emily Milk 239 9872 142 2435 2663 21307 8
Helen Bread 2534 981 4239 1987 2781 25032 9
. . . .
Report #5:
CUSTOMER PRODUCT NJ_MAX DATE NY_MAX DATE CT_MAX DATE
======== ======= ====== ========== ====== ========== ====== ==========
Sam Egg 7908 01/11/2001 2405 07/24/2005 1932 11/03/2008
Helen Cookies 392 03/31/2002 1042 09/14/2000 811 07/23/2002
Bloom Butter 1045 09/22/2003 2023 03/10/2004 2988 09/11/2006

Grading NOTE: A query with syntax errors will lose 50% of the points for the query.
Submission Submit a file containing all of the 5 queries or 5 separate files with each query in a separate file
with your name and CWID on it on Canvas. If you create 5 separate files, please place them in a
ZIP file and submit the ZIP file.