Assignment two

02_activities/assignments/DC_Cohort/Assignment2.md

@@ -193,4 +193,10 @@ Consider, for example, concepts of labour, bias, LLM proliferation, moderating c
 
 ```
 Your thoughts...
+I think the key takeaway from this article is that AI and machine learning is driven by humans, and that will inevitably lead to a human bias. For some tasks such as training AI to fold a towel, the human labour involved won't produce issues for practice, but for something like the person subtree of ImageNet then it can pose a huge challenge. Sorting out bad actors in image identification databases reminds me of Wikipedia and how it is an open website that anybody can update information or misinformation with. Although it does take a lot of human labour to train the database, the product can still be used effectively if human bias can be accounted for. Wikipedia is for the most part a good resource. But it should still be used with context, triangulation, and nuance.
+
+Adding onto human bias, I think that many people understand intuitively but not explicitly that AI or machine learning can seem neutral, but because humans train them and set their parameters they are not. For example if AI is used to summarize news based on articles with the most 'organic views' or other parameters, it may end up pushing narratives that are from a majority political viewpoint and exclude minority ones. To further problematize the issue, once an algorithm, is known certain actors may try to cheat the algorithm by optimizing certain parameters in a way that is beneficial towards them.
+
+That being said I think there is a lot of room for AI to solve problems that are human-adjacent with low stakes, and that high stakes decisions should be very critically scrutinized. For example there are court cases of arrests made on individuals with facial recognition software. Like in the article I would be happy if a robot could fold all my laundry and clothes, but I definitely would not want arrests to be made based on software that is potentially flawed or error prone, at least without multiple humans checking the software's output.
+
 ```

02_activities/assignments/DC_Cohort/assignment1.sql

@@ -7,7 +7,7 @@
 /* 1. Write a query that returns everything in the customer table. */
 --QUERY 1
 
-
+SELECT * FROM customer;
 
 
 --END QUERY
@@ -17,7 +17,9 @@
 sorted by customer_last_name, then customer_first_ name. */
 --QUERY 2
 
-
+SELECT * FROM customer
+ORDER BY customer_last_name, customer_first_name
+LIMIT 10;
 
 
 --END QUERY
@@ -28,6 +30,9 @@ sorted by customer_last_name, then customer_first_ name. */
 Limit to 25 rows of output. */
 --QUERY 3
 
+SELECT * FROM customer_purchases
+WHERE product_id = "1" OR product_id = "4"
+LIMIT 25;
 
 
 
@@ -43,7 +48,10 @@ Limit to 25 rows of output.
 */
 --QUERY 4
 
-
+SELECT customer_id, quantity, cost_per_quantity, quantity * cost_per_quantity AS price
+FROM customer_purchases
+WHERE customer_id >= 8 AND customer_id <=10
+LIMIT 25;
 
 
 --END QUERY
@@ -56,6 +64,13 @@ columns and add a column called prod_qty_type_condensed that displays the word 
 if the product_qty_type is “unit,” and otherwise displays the word “bulk.” */
 --QUERY 5
 
+SELECT product_id, product_name,
+CASE
+	WHEN product_qty_type = "unit" THEN "unit"
+	WHEN product_qty_type != "unit" THEN "bulk"
+
+	END AS product_qty_type_condensed
+FROM product
 
 
 
@@ -67,6 +82,16 @@ add a column to the previous query called pepper_flag that outputs a 1 if the pr
 contains the word “pepper” (regardless of capitalization), and otherwise outputs 0. */
 --QUERY 6
 
+SELECT product_id, product_name,
+CASE
+	WHEN product_qty_type = "unit" THEN "unit"
+	WHEN product_qty_type != "unit" THEN "bulk"
+
+	END AS product_qty_type_condensed,
+CASE
+	WHEN product_name LIKE '%pepper%' THEN "1" ELSE "0"
+	END AS pepper_flag
+FROM product
 
 
 
@@ -79,6 +104,11 @@ vendor_id field they both have in common, and sorts the result by market_date, t
 Limit to 24 rows of output. */
 --QUERY 7
 
+SELECT *
+FROM vendor
+INNER JOIN vendor_booth_assignments
+ON vendor.vendor_id = vendor_booth_assignments.vendor_id
+ORDER BY market_date, vendor_name;
 
 
 
@@ -93,7 +123,10 @@ Limit to 24 rows of output. */
 at the farmer’s market by counting the vendor booth assignments per vendor_id. */
 --QUERY 8
 
-
+SELECT *,
+COUNT(vendor_id)
+FROM vendor_booth_assignments
+GROUP BY vendor_id
 
 
 --END QUERY
@@ -106,7 +139,14 @@ 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. */
 --QUERY 9
 
-
+SELECT *,
+SUM(cost_per_quantity * quantity) AS customer_total
+FROM customer
+INNER JOIN customer_purchases
+ON customer.customer_id = customer_purchases.customer_id
+GROUP BY customer.customer_id
+HAVING SUM(cost_per_quantity * quantity)>2000
+ORDER BY customer_last_name, customer_first_name;
 
 
 --END QUERY
@@ -116,6 +156,8 @@ HINT: This query requires you to join two tables, use an aggregate function, and
 /* 1. Insert the original vendor table into a temp.new_vendor and then add a 10th vendor: 
 Thomass Superfood Store, a Fresh Focused store, owned by Thomas Rosenthal
 
+
+
 HINT: This is two total queries -- first create the table from the original, then insert the new 10th vendor. 
 When inserting the new vendor, you need to appropriately align the columns to be inserted 
 (there are five columns to be inserted, I've given you the details, but not the syntax) 
@@ -126,7 +168,11 @@ VALUES(col1,col2,col3,col4,col5)
 --QUERY 10
 
 
+CREATE TEMP TABLE temp.new_vendor AS
+SELECT * FROM vendor;
 
+INSERT INTO temp.new_vendor
+VALUES (10, "Thomass Superfood Store", "Fresh Focused Store","Thomas", "Rosenthal");
 
 --END QUERY
 
@@ -139,7 +185,14 @@ and year are!
 Limit to 25 rows of output. */
 --QUERY 11
 
+SELECT *,
+
+strftime("%m", market_date) AS month,
+strftime("%Y", market_date) AS year
+
+FROM customer_purchases
 
+LIMIT 25;
 
 
 --END QUERY
@@ -153,6 +206,17 @@ but remember, STRFTIME returns a STRING for your WHERE statement...
 AND be sure you remove the LIMIT from the previous query before aggregating!! */
 --QUERY 12
 
+SELECT *,
+
+strftime("%m", market_date) AS month,
+strftime("%Y", market_date) AS year,
+SUM(cost_per_quantity * quantity) AS customer_total
+
+FROM customer_purchases
+WHERE strftime("%m", market_date)= "03" AND strftime("%Y", market_date) = "2023"
+GROUP BY customer_id
+
+LIMIT 25;
 
 
 

02_activities/assignments/DC_Cohort/assignment2.sql

@@ -22,6 +22,9 @@ The `||` values concatenate the columns into strings.
 Edit the appropriate columns -- you're making two edits -- and the NULL rows will be fixed. 
 All the other rows will remain the same. */
 --QUERY 1
+SELECT 
+product_name || ', ' || COALESCE(product_size, '')|| ' (' || COALESCE(product_qty_type, 'unit') || ')'
+FROM product
 
 
 
@@ -40,8 +43,11 @@ each new market date for each customer, or select only the unique market dates p
 HINT: One of these approaches uses ROW_NUMBER() and one uses DENSE_RANK(). 
 Filter the visits to dates before April 29, 2022. */
 --QUERY 2
-
-
+SELECT customer_id, market_date,
+ROW_NUMBER() OVER (PARTITION BY customer_id) AS visit
+FROM customer_purchases
+WHERE market_date < '2022-04-29'
+ORDER BY customer_id
 
 
 --END QUERY
@@ -52,6 +58,15 @@ then write another query that uses this one as a subquery (or temp table) and fi
 only the customer’s most recent visit.
 HINT: Do not use the previous visit dates filter. */
 --QUERY 3
+SELECT customer_id, market_date,
+FROM (
+SELECT customer_id, market_date,
+ROW_NUMBER() OVER (PARTITION BY customer_id ORDER BY market_date DESC) AS visit
+FROM customer_purchases
+ORDER BY customer_id )
+
+WHERE visit = 1
+
 
 
 
@@ -66,6 +81,11 @@ You can make this a running count by including an ORDER BY within the PARTITION
 Filter the visits to dates before April 29, 2022. */
 --QUERY 4
 
+SELECT product_id, customer_id,
+COUNT(product_id)
+FROM customer_purchases
+WHERE market_date > '2022-03-29'
+GROUP BY product_id, customer_id
 
 
 
@@ -84,7 +104,12 @@ Remove any trailing or leading whitespaces. Don't just use a case statement for
 
 Hint: you might need to use INSTR(product_name,'-') to find the hyphens. INSTR will help split the column. */
 --QUERY 5
-
+SELECT product_name,
+CASE
+	WHEN INSTR(product_name, '-') <> 0 THEN 'yes'
+	ELSE NULL
+END AS hyphen_indicator	
+FROM product;
 
 
 
@@ -94,6 +119,9 @@ Hint: you might need to use INSTR(product_name,'-') to find the hyphens. INSTR w
 /* 2. Filter the query to show any product_size value that contain a number with REGEXP. */
 --QUERY 6
 
+SELECT product_name, product_size
+FROM product
+WHERE product_size REGEXP '[0-9]'
 
 
 
@@ -111,6 +139,27 @@ HINT: There are a possibly a few ways to do this query, but if you're struggling
 with a UNION binding them. */
 --QUERY 7
 
+CREATE TEMP TABLE highest_price AS
+SELECT market_date,
+SUM (quantity*cost_per_quantity) AS price
+
+FROM customer_purchases
+GROUP BY market_date
+ORDER BY price DESC
+LIMIT 1;
+
+CREATE TEMP TABLE lowest_price AS
+SELECT market_date,
+SUM (quantity*cost_per_quantity) AS price
+
+FROM customer_purchases
+GROUP BY market_date
+ORDER BY price ASC
+LIMIT 1;
+
+SELECT * FROM highest_price
+UNION ALL
+SELECT * FROM lowest_Price
 
 
 
@@ -132,7 +181,27 @@ How many customers are there (y).
 Before your final group by you should have the product of those two queries (x*y).  */
 --QUERY 8
 
+DROP TABLE IF EXISTS total_sales;
+
+CREATE TEMPORARY TABLE total_sales AS
+SELECT vendor_id, product_id, customer_id,
+SUM(original_price * 5) AS saleof5
 
+
+FROM (
+SELECT v.vendor_id, v.original_price, v.product_id, c.customer_id
+FROM (SELECT vendor_id, original_price, product_id FROM vendor_inventory) AS v
+CROSS JOIN (SELECT customer_id FROM customer) AS c
+GROUP BY v.vendor_id, v.original_price, v.product_id, c.customer_id
+)
+GROUP BY vendor_id, product_id;
+
+SELECT vendor_name, product_name, saleof5
+FROM total_sales
+INNER JOIN product AS p
+ON total_sales.product_id = p.product_id
+INNER JOIN vendor as v
+ON total_sales.vendor_id = v.vendor_id
 
 
 --END QUERY
@@ -145,7 +214,13 @@ It should use all of the columns from the product table, as well as a new column
 Name the timestamp column `snapshot_timestamp`. */
 --QUERY 9
 
+DROP TABLE IF EXISTS product_units;
 
+CREATE TEMPORARY TABLE product_units AS
+SELECT *,
+CURRENT_TIMESTAMP AS snapshot_timestamp
+FROM product
+WHERE product_qty_type = 'unit'
 
 
 --END QUERY
@@ -155,6 +230,7 @@ Name the timestamp column `snapshot_timestamp`. */
 This can be any product you desire (e.g. add another record for Apple Pie). */
 --QUERY 10
 
+INSERT INTO product_units VALUES (99, 'Pears', 'medium', 99, 'unit', CURRENT_TIMESTAMP)
 
 
 
@@ -167,6 +243,7 @@ This can be any product you desire (e.g. add another record for Apple Pie). */
 HINT: If you don't specify a WHERE clause, you are going to have a bad time.*/
 --QUERY 11
 
+DELETE FROM product_units WHERE product_id = 99
 
 
 
@@ -191,7 +268,19 @@ Finally, make sure you have a WHERE statement to update the right row,
 When you have all of these components, you can run the update statement. */
 --QUERY 12
 
+UPDATE product_units
+SET current_quantity = COALESCE(current_quantity, '');
+
+UPDATE product_units
+SET current_quantity = v.quantity 
+
+FROM 
+( SELECT market_date, quantity, product_id, vendor_id 
+FROM vendor_inventory 
+GROUP BY product_id 
+ORDER BY market_date DESC) AS v
 
+WHERE v.product_id = product_units.product_id;
 
 
 --END QUERY