Assignment two

02_activities/assignments/DC_Cohort/Assignment1.md

@@ -210,4 +210,5 @@ Consider, for example, concepts of fariness, inequality, social structures, marg
 
 ```
 Your thoughts...
+The value systems embeded in databases (e.g., health care records, social media etc) I encountr every day include the efficiency, visibility etc. Designing system should also consider the flexibility to reflect the real worlds reality to aovid turning for example complex diversity into technical issues as shown in this article.    
 ```

02_activities/assignments/DC_Cohort/Assignment2.md

@@ -190,6 +190,5 @@ Read: Boykis, V. (2019, October 16). _Neural nets are just people all the way do
 Consider, for example, concepts of labour, bias, LLM proliferation, moderating content, intersection of technology and society, ect. 
 
 
-```
-Your thoughts...
+```AI is not replacing human work but change the content or type of human work. Importantly, a ethics question would be that AI outputs really depends on human judgment eventually, in that case, some bias is not inevitable. Therefore, AI are not outputing accurate final answers, so the role of human in interprating thoese answers actually as importnat as providing valid original data and careful criteria at the very beinging. 
 ```

02_activities/assignments/DC_Cohort/assignment1.sql

@@ -6,31 +6,33 @@
 --SELECT
 /* 1. Write a query that returns everything in the customer table. */
 --QUERY 1
-
-
-
-
+SELECT *
+FROM customer;
 --END QUERY
 
 
 /* 2. Write a query that displays all of the columns and 10 rows from the customer table, 
 sorted by customer_last_name, then customer_first_ name. */
 --QUERY 2
-
-
-
-
+SELECT customer_last_name
+,customer_first_name
+,customer_id
+,customer_postal_code 
+FROM customer
+ORDER BY customer_last_name, customer_first_name
+LIMIT 10;
 --END QUERY
 
 
 --WHERE
 /* 1. Write a query that returns all customer purchases of product IDs 4 and 9. 
 Limit to 25 rows of output. */
 --QUERY 3
-
-
-
-
+SELECT *
+FROM customer_purchases
+WHERE product_id = 4 
+OR product_id = 9
+LIMIT 25;
 --END QUERY
 
 
@@ -42,10 +44,18 @@ filtered by customer IDs between 8 and 10 (inclusive) using either:
 Limit to 25 rows of output.
 */
 --QUERY 4
-
-
-
-
+SELECT product_id
+,vendor_id
+,market_date
+,customer_id
+,quantity
+,cost_to_customer_per_qty
+,transaction_time
+,(quantity * cost_to_customer_per_qty) as price
+FROM customer_purchases 
+WHERE customer_id BETWEEN 8 AND 10
+ORDER BY customer_id
+LIMIT 25;
 --END QUERY
 
 
@@ -55,21 +65,32 @@ Using the product table, write a query that outputs the product_id and product_n
 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.” */
 --QUERY 5
-
-
-
-
+SELECT product_id
+,product_name
+,CASE WHEN product_qty_type = "unit"
+ THEN "unit"
+ ELSE "bulk"
+ END as prod_qty_type_condensed
+FROM PRODUCT;
 --END QUERY
 
 
 /* 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. */
 --QUERY 6
-
-
-
-
+SELECT product_id
+,product_name
+,CASE WHEN product_qty_type = "unit"
+ THEN "unit"
+ ELSE "bulk"
+ END as prod_qty_type_condensed
+
+,CASE WHEN product_name LIKE '%pepper%'
+ THEN 1
+ ELSE 0
+ END as pepper_flag
+FROM PRODUCT;
 --END QUERY
 
 
@@ -78,10 +99,14 @@ contains the word “pepper” (regardless of capitalization), and otherwise out
 vendor_id field they both have in common, and sorts the result by market_date, then vendor_name.
 Limit to 24 rows of output. */
 --QUERY 7
-
-
-
-
+SELECT vba.market_date
+,vendor_name
+,v.vendor_id
+FROM vendor AS v
+INNER JOIN vendor_booth_assignments AS vba
+	ON v.vendor_id = vba.vendor_id
+ORDER BY vba.market_date,vendor_name
+LIMIT 24;
 --END QUERY
 
 
@@ -92,10 +117,10 @@ Limit to 24 rows of output. */
 /* 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. */
 --QUERY 8
-
-
-
-
+SELECT vendor_id
+,COUNT(vendor_id) as num_of_vendor
+From vendor_booth_assignments
+GROUP BY vendor_id;
 --END QUERY
 
 
@@ -105,10 +130,16 @@ 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 c.customer_last_name
+,c.customer_first_name
+,c.customer_id
+,SUM(cost_to_customer_per_qty*quantity) as total_cost
+FROM customer_purchases AS cp
+RIGHT JOIN customer AS c
+ON c.customer_id = cp.customer_id
+GROUP BY c.customer_id
+HAVING total_cost >= 2000
+ORDER BY customer_last_name,customer_first_name;
 --END QUERY
 
 
@@ -124,10 +155,17 @@ When inserting the new vendor, you need to appropriately align the columns to be
 VALUES(col1,col2,col3,col4,col5) 
 */
 --QUERY 10
+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', 'a Fresh Focused store', 'Thomas', 'Rosenthal');
 
-
+SELECT * 
+FROM temp.new_vendor;
 --END QUERY
 
 
@@ -138,10 +176,12 @@ HINT: you might need to search for strfrtime modifers sqlite on the web to know
 and year are! 
 Limit to 25 rows of output. */
 --QUERY 11
-
-
-
-
+SELECT customer_id
+,strftime('%m',market_date) as month
+,strftime('%Y',market_date) as year
+,market_date
+FROM customer_purchases
+LIMIT 25;
 --END QUERY
 
 
@@ -152,8 +192,11 @@ HINTS: you will need to AGGREGATE, GROUP BY, and filter...
 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 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;
 --END QUERY