Assignment one

02_activities/assignments/Microcredential_Cohort/assignment1.sql

@@ -6,31 +6,38 @@
 --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 *
+FROM customer
+ORDER BY customer_first_name ASC, customer_last_name ASC
+LIMIT 10;
+
+-- QUALITY CHECKING: trying the DESC version to see if organizes names from Z to A
+/*
+SELECT *
+FROM customer
+ORDER BY customer_first_name DESC, customer_last_name DESC
+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
-
-
-
 
+--QUERY 3
+SELECT * FROM customer_purchases
+WHERE product_id == 1
+OR product_id == 4;
 --END QUERY
 
 
@@ -42,10 +49,20 @@ filtered by customer IDs between 8 and 10 (inclusive) using either:
 Limit to 25 rows of output.
 */
 --QUERY 4
-
-
-
-
+SELECT * 
+,(quantity* cost_to_customer_per_qty) as price
+FROM customer_purchases
+WHERE customer_id BETWEEN 8 AND 10
+LIMIT 25;
+
+/* CAN ALSO BE WRITTEN AS:
+SELECT * 
+,(quantity* cost_to_customer_per_qty) as price
+FROM customer_purchases
+WHERE customer_id > 7  
+AND customer_id < 11
+LIMIT 25;
+*/
 --END QUERY
 
 
@@ -55,10 +72,13 @@ 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, prod_qty_type_condensed
+FROM (
+SELECT product_id, product_name, product_qty_type
+,CASE WHEN product_qty_type= 'unit' THEN 'unit'
+ELSE 'bulk' END as prod_qty_type_condensed
+FROM product
+);
 --END QUERY
 
 
@@ -67,8 +87,16 @@ 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, pepper_flag, prod_qty_type_condensed
+FROM (
+SELECT product_id, product_name, product_qty_type -- THESE ARE THE COLUMNS NEEDED 
+,CASE WHEN product_qty_type= 'unit' THEN 'unit'
+ELSE 'bulk' END AS prod_qty_type_condensed
 
-
+, CASE WHEN product_name LIKE '%pepper%' THEN 1 -- LIKE MEANS TEXT IS SEARCHED FOR PEPPER REGARDLESS OF CAPITALIZATION
+ELSE 0 	END AS pepper_flag
+FROM product
+);
 
 --END QUERY
 
@@ -78,37 +106,50 @@ 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 vendor.vendor_id, vendor_name, vendor_type, vendor_owner_first_name, vendor_owner_last_name, -- originating from vendor table
+vendor_booth_assignments.vendor_id, booth_number, market_date  -- originating from vendor booth assignments
+FROM vendor 
+INNER JOIN vendor_booth_assignments
+	ON vendor.vendor_id = vendor_booth_assignments.vendor_id  
+ORDER BY market_date ASC, vendor_name ASC;
 --END QUERY
 
 
-
 /* SECTION 3 */
 
 -- 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. */
 --QUERY 8
 
+-- This version only lists the vendor id
+SELECT vendor_id, COUNT(booth_number) as Num_times_rented
+FROM vendor_booth_assignments
+GROUP BY vendor_id;
 
-
+-- This version lists the vendor id and the corresponding name
+SELECT COUNT(booth_number) as Num_times_rented, vendor.vendor_id, vendor.vendor_name
+FROM vendor 
+INNER JOIN vendor_booth_assignments -- inner join returns values on vendor_id that are matching in both tables
+	ON vendor.vendor_id = vendor_booth_assignments.vendor_id  
+GROUP BY vendor.vendor_id;
 
 --END QUERY
 
-
 /* 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. */
 --QUERY 9
-
-
-
-
+SELECT customer.customer_id, customer_first_name, customer_last_name, 
+SUM(quantity* cost_to_customer_per_qty) as total_spend -- AGGREGATE FUNCTION
+FROM  customer 
+INNER JOIN customer_purchases -- JOINING 2 TABLES
+	ON  customer.customer_id = customer_purchases.customer_id  
+GROUP BY customer.customer_id
+HAVING total_spend > 2000 -- HAVING KEY WORD
+ORDER BY customer_first_name ASC, customer_last_name;
 --END QUERY
 
 
@@ -125,7 +166,14 @@ 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 (vendor_id, vendor_name, vendor_type, vendor_owner_first_name, vendor_owner_last_name)
+VALUES (10, 'Thomass Superfood Store', 'a Fresh Focused store', 'Thomas', 'Rosenthal');
 
 
 --END QUERY
@@ -139,8 +187,11 @@ and year are!
 Limit to 25 rows of output. */
 --QUERY 11
 
-
-
+SELECT  customer_id 
+,strftime('%Y', market_date) AS year -- modifier for year is %Y
+,strftime('%m', market_date) AS month -- modifier for month is %m
+from customer_purchases
+LIMIT 25;
 
 --END QUERY
 
@@ -153,7 +204,12 @@ 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('%Y', market_date) AS year -- modifier for year is %Y
+,strftime('%m', market_date) AS month -- modifier for month is %m
+,SUM(quantity* cost_to_customer_per_qty) as total_spend -- AGGREGATE FUNCTION
+FROM customer_purchases
+WHERE month = '04' AND year=='2022'
+GROUP BY customer_id;
 
 --END QUERY