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Create pull request of homework3 for approval #3

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43 changes: 42 additions & 1 deletion 02_activities/homework/homework_3.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -2,14 +2,27 @@
/* 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. */


Answer:
SELECT vendor_id, count(vendor_id)
FROM vendor_booth_assignments
GROUP BY vendor_id

/* 2. The Farmer’s Market Customer Appreciation Committee wants to give a bumper
sticker to everyone who has ever spent more than $2000 at the market. Write a query that generates a list
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. */

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


--Temp Table
Expand All @@ -24,6 +37,16 @@ When inserting the new vendor, you need to appropriately align the columns to be
VALUES(col1,col2,col3,col4,col5)
*/

Answer:
DROP TABLE IF EXISTS new_vendor;

CREATE TEMP TABLE new_vendor AS

SELECT *
FROM vendor;

INSERT INTO temp.new_vendor (vendor_id, vendor_name, vendor_type, vendor_owner_first_name, vendor_owner_last_name)
VALUES (10, 'Thomass Superfood Store', 'Fresh Focused', 'Thomas', 'Rosenthal');


-- Date
Expand All @@ -32,9 +55,27 @@ 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! */

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

I assume that the column of 'market_date' is the date of every purchase.


/* 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!! */

Answer:

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