Assignment one

02_activities/assignments/Microcredential_Cohort/assignment1.sql

@@ -6,8 +6,8 @@
 --SELECT
 /* 1. Write a query that returns everything in the customer table. */
 --QUERY 1
-
-
+SELECT *
+FROM customer;
 
 
 --END QUERY
@@ -16,8 +16,10 @@
 /* 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 * 
+FROM customer
+ORDER BY customer_last_name, customer_first_name
+LIMIT 10;
 
 
 --END QUERY
@@ -27,8 +29,11 @@ sorted by customer_last_name, then customer_first_ name. */
 /* 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 IN (4,9)
+-- WHERE product_id IN (4,8) -- debug only
+LIMIT 25;
 
 
 --END QUERY
@@ -42,8 +47,15 @@ filtered by customer IDs between 8 and 10 (inclusive) using either:
 Limit to 25 rows of output.
 */
 --QUERY 4
-
-
+/*
+SELECT *
+FROM customer_purchases
+where (quantity * cost_to_customer_per_qty) as price
+*/
+SELECT *, (quantity * cost_to_customer_per_qty) as price
+FROM customer_purchases
+WHERE customer_id BETWEEN 8 AND 10
+LIMIT 25;
 
 
 --END QUERY
@@ -56,7 +68,13 @@ 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
+--,product_qty_type -- debug oonly
+,CASE WHEN product_qty_type = 'unit' THEN 'unit'
+	ELSE 'bulk' 
+	END as prod_qty_type_condensed
 
+FROM product;
 
 
 --END QUERY
@@ -66,8 +84,15 @@ if the product_qty_type is “unit,” and otherwise displays the word “bulk.
 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
+--,product_qty_type -- debug oonly
+,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
@@ -78,8 +103,13 @@ 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 *
 
-
+FROM vendor as v
+INNER JOIN vendor_booth_assignments as vba
+		on v.vendor_id=vba.vendor_id
+ORDER BY market_date, vendor_name
+LIMIT 24;
 
 
 --END QUERY
@@ -92,8 +122,10 @@ 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_rent
 
-
+FROM vendor_booth_assignments
+GROUP by vendor_id;
 
 
 --END QUERY
@@ -105,9 +137,25 @@ 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 
+--market_date, --debug only
+cp.customer_id,
+c.customer_last_name, 
+c.customer_first_name,
+sum(quantity*cost_to_customer_per_qty) as total_spend
+
+FROM customer_purchases as cp
+INNER JOIN customer as c
+	on c.customer_id=cp.customer_id
+
+GROUP by cp.customer_id
+HAVING total_spend >2000
+ORDER by customer_last_name COLLATE nocase, customer_first_name COLLATE nocase;
+
+/*
+**remark. add COLLATE nocase as without it the customer_last_name "da Silva" will be listed at the end.
+what are the industrial general practice?
+*/
 
 --END QUERY
 
@@ -125,7 +173,21 @@ VALUES(col1,col2,col3,col4,col5)
 */
 --QUERY 10
 
+-- create the TEMPORARY TABLE
+DROP TABLE if EXISTS temp.new_vendor;
 
+CREATE TABLE temp.new_vendor as 
+
+SELECT *
+FROM vendor ;
+
+-- add new vendor into 10th ROW 
+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 store', 'Thomas', 'Rosenthal') ;
+
+-- show new row for debug
+SELECT *
+FROM temp.new_vendor;
 
 
 --END QUERY
@@ -138,8 +200,14 @@ 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,
+-- market_date, -- for debug
+strftime ('%m', market_date) as month,
+strftime ('%Y', market_date) as year
 
-
+FROM customer_purchases
+LIMIT 25;
 
 
 --END QUERY
@@ -152,7 +220,20 @@ 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,
+-- market_date, -- for debug
+-- strftime ('%m', market_date) as month, --for debug
+-- strftime ('%Y', market_date) as year, --for debug
+-- (quantity*cost_to_customer_per_qty) as customer_spent, --for debug
+sum(quantity*cost_to_customer_per_qty) as total_customer_spent
+
+FROM customer_purchases --;
+
+WHERE (strftime ('%Y', market_date)) = '2022' --in April 2022
+AND (strftime ('%m', market_date)) = '04' --in April 2022
+-- Where (strftime ('%m', market_date)) = '04' --in April 2022 -- for debug
+GROUP by customer_id;