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TITLE: UofT-DSI | SQL - Assignment 1 #1

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TITLE: UofT-DSI | SQL - Assignment 1 #1

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91 changes: 78 additions & 13 deletions 02_activities/assignments/assignment1.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -5,20 +5,30 @@
--SELECT
/* 1. Write a query that returns everything in the customer table. */


SELECT *
FROM customer;

/* 2. Write a query that displays all of the columns and 10 rows from the cus- tomer table,
sorted by customer_last_name, then customer_first_ name. */

SELECT *
FROM customer
ORDER BY customer_last_name ASC, customer_first_name ASC
LIMIT 10;


--WHERE
/* 1. Write a query that returns all customer purchases of product IDs 4 and 9. */
-- option 1

SELECT *
FROM customer_purchases
WHERE product_id IN (4, 9);

-- option 2

SELECT *
FROM customer_purchases
WHERE product_id = 4
OR product_id = 9;


/*2. Write a query that returns all customer purchases and a new calculated column 'price' (quantity * cost_to_customer_per_qty),
Expand All @@ -27,30 +37,56 @@ filtered by vendor IDs between 8 and 10 (inclusive) using either:
2. one condition using BETWEEN
*/
-- option 1


SELECT *,
quantity*cost_to_customer_per_qty AS price
FROM customer_purchases
WHERE vendor_id >= 8
AND vendor_id <=10;
-- option 2


SELECT *,
quantity*cost_to_customer_per_qty AS price
FROM customer_purchases
WHERE vendor_id BETWEEN 8 AND 10;

--CASE
/* 1. Products can be sold by the individual unit or by bulk measures like lbs. or oz.
Using the product table, write a query that outputs the product_id and product_name
columns and add a column called prod_qty_type_condensed that displays the word “unit”
if the product_qty_type is “unit,” and otherwise displays the word “bulk.” */


SELECT product_id, product_name,
CASE
WHEN product_qty_type = 'unit'
THEN 'unit'
ELSE 'bulk'
END as product_qty_type_condensed
FROM product;

/* 2. We want to flag all of the different types of pepper products that are sold at the market.
add a column to the previous query called pepper_flag that outputs a 1 if the product_name
contains the word “pepper” (regardless of capitalization), and otherwise outputs 0. */

SELECT product_id, product_name,
CASE
WHEN product_qty_type = 'unit'
THEN 'unit'
ELSE 'bulk'
END as product_qty_type_condensed
,CASE
WHEN product_name LIKE '%pepper%'
THEN 1
ELSE 0
END as pepper_flag
FROM product;


--JOIN
/* 1. Write a query that INNER JOINs the vendor table to the vendor_booth_assignments table on the
vendor_id field they both have in common, and sorts the result by vendor_name, then market_date. */

SELECT *
FROM vendor
INNER JOIN vendor_booth_assignments
ON vendor.vendor_id = vendor_booth_assignments.vendor_id
ORDER BY vendor_name ASC, market_date ASC;



Expand All @@ -59,7 +95,10 @@ vendor_id field they both have in common, and sorts the result by vendor_name, t
-- AGGREGATE
/* 1. Write a query that determines how many times each vendor has rented a booth
at the farmer’s market by counting the vendor booth assignments per vendor_id. */

SELECT
vendor_id, COUNT(vendor_id) AS num_rented
FROM vendor_booth_assignments
GROUP BY vendor_id;


/* 2. The Farmer’s Market Customer Appreciation Committee wants to give a bumper
Expand All @@ -68,7 +107,13 @@ of customers for them to give stickers to, sorted by last name, then first name.

HINT: This query requires you to join two tables, use an aggregate function, and use the HAVING keyword. */


SELECT customer_first_name,customer_last_name, SUM(quantity*cost_to_customer_per_qty ) AS total_spent
FROM customer_purchases
INNER JOIN customer
ON customer_purchases.customer_id = customer.customer_id
GROUP BY customer_purchases.customer_id
HAVING total_spent >= 2000
ORDER BY customer_last_name ASC, customer_first_name ASC;

--Temp Table
/* 1. Insert the original vendor table into a temp.new_vendor and then add a 10th vendor:
Expand All @@ -82,6 +127,14 @@ When inserting the new vendor, you need to appropriately align the columns to be
VALUES(col1,col2,col3,col4,col5)
*/

DROP TABLE IF EXISTS temp.new_vendor;
CREATE TABLE temp.new_vendor AS
SELECT *
FROM vendor;


INSERT INTO temp.new_vendor
VALUES (10, 'Thomass Superfood Store', 'Fresh Focused', 'Thomas', 'Rosenthal');


-- Date
Expand All @@ -90,11 +143,23 @@ VALUES(col1,col2,col3,col4,col5)
HINT: you might need to search for strfrtime modifers sqlite on the web to know what the modifers for month
and year are! */


SELECT customer_id,
strftime('%m', market_date) AS month,
strftime('%Y', market_date) AS year
FROM customer_purchases;

/* 2. Using the previous query as a base, determine how much money each customer spent in April 2022.
Remember that money spent is quantity*cost_to_customer_per_qty.

HINTS: you will need to AGGREGATE, GROUP BY, and filter...
but remember, STRFTIME returns a STRING for your WHERE statement!! */


SELECT customer_id,
strftime('%m', market_date) AS month,
strftime('%Y', market_date) AS year,
SUM(quantity * cost_to_customer_per_qty) AS total_spent
FROM customer_purchases
WHERE month = '04'
AND year = '2022'
GROUP BY customer_id;