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57 changes: 55 additions & 2 deletions 02_activities/homework/homework_3.sql
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Original file line number Diff line number Diff line change
@@ -1,7 +1,17 @@
-- 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
v.vendor_id,
COUNT(vba.booth_number) AS number_of_booths_rented
FROM
Vendor v
JOIN
vendor_booth_assignments vba ON v.vendor_id = vba.vendor_id
GROUP BY
v.vendor_id
ORDER BY
v.vendor_id;


/* 2. The Farmer’s Market Customer Appreciation Committee wants to give a bumper
Expand All @@ -10,7 +20,21 @@ 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
c.customer_id,
c.customer_first_name,
c.customer_last_name,
SUM(cp.cost_to_customer_per_qty * cp.quantity) 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.cost_to_customer_per_qty * cp.quantity) > 2000
ORDER BY
c.customer_last_name, c.customer_first_name;

--Temp Table
/* 1. Insert the original vendor table into a temp.new_vendor and then add a 10th vendor:
Expand All @@ -24,17 +48,46 @@ When inserting the new vendor, you need to appropriately align the columns to be
VALUES(col1,col2,col3,col4,col5)
*/

CREATE TEMPORARY TABLE temp.new_vendor AS
SELECT *
FROM vendor
WHERE 1=0;

INSERT INTO temp.new_vendor
SELECT *
FROM vendor;

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

-- Date
/*1. Get the customer_id, month, and year (in separate columns) of every purchase in the customer_purchases table.

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