sql assignment1 - Sultan Mehmood

02_activities/assignments/Cohort_8/assignment1.sql

@@ -5,16 +5,31 @@
 --SELECT
 /* 1. Write a query that returns everything in the customer table. */
 
+SELECT *
+FROM customer
 
 
 /* 2. Write a query that displays all of the columns and 10 rows from the cus- tomer table, 
 sorted by customer_last_name, then customer_first_ name. */
 
+SELECT *
 
+FROM customer
+
+ORDER By 
+	customer_last_name, customer_first_name
+LIMIT 10
 
 --WHERE
 /* 1. Write a query that returns all customer purchases of product IDs 4 and 9. */
 
+SELECT *
+FROM customer_purchases
+
+WHERE 
+	product_id = 4
+AND product_id = 9
+
 
 
 /*2. Write a query that returns all customer purchases and a new calculated column 'price' (quantity * cost_to_customer_per_qty), 
@@ -24,9 +39,29 @@ filtered by customer IDs between 8 and 10 (inclusive) using either:
 */
 -- option 1
 
+SELECT
+quantity,
+customer_id,
+cost_to_customer_per_qty,
+quantity * cost_to_customer_per_qty AS price
+
+FROM customer_purchases
+
+WHERE 
+	customer_id >= 8 AND customer_id <= 10;
+
 
 -- option 2
 
+SELECT
+quantity,
+customer_id,
+cost_to_customer_per_qty,
+quantity * cost_to_customer_per_qty AS price
+
+FROM customer_purchases
+
+WHERE customer_id BETWEEN 8 AND 10;
 
 
 --CASE
@@ -35,19 +70,48 @@ 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.” */
 
+SELECT
+	product_id,
+	product_name,
 
+CASE 
+	WHEN product_qty_type = 'unit' THEN 'unit'
+	ELSE 'bulk'
+END AS product_qty_type_condensed
+
+FROM product;
 
 /* 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. */
 
+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;
 
 
 --JOIN
 /* 1. Write a query that INNER JOINs the vendor table to the vendor_booth_assignments table on the 
 vendor_id field they both have in common, and sorts the result by vendor_name, then market_date. */
 
+SELECT * 
+
+FROM vendor
+
+INNER JOIN vendor_booth_assignments
+	ON vendor.vendor_id = vendor_booth_assignments.vendor_id
 
+	ORDER BY vendor_name, market_date;
 
 
 /* SECTION 3 */
@@ -56,15 +120,33 @@ vendor_id field they both have in common, and sorts the result by vendor_name, t
 /* 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 
+vendor_id,
+COUNT(*) as num_of_booth
 
+FROM vendor_booth_assignments
+
+GROUP BY vendor_id;
 
 /* 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. */
 
+SELECT *
+	,SUM(quantity*cost_to_customer_per_qty) AS total_spend 
+
+FROM customer_purchases AS cp
+	INNER JOIN customer AS c 
+	ON cp.customer_id = c.customer_id
+
+GROUP BY customer_first_name, customer_last_name
+
+HAVING total_spend > 2000
 
+ORDER BY
+customer_last_name, customer_first_name;
 
 --Temp Table
 /* 1. Insert the original vendor table into a temp.new_vendor and then add a 10th vendor: 
@@ -78,19 +160,18 @@ When inserting the new vendor, you need to appropriately align the columns to be
 VALUES(col1,col2,col3,col4,col5) 
 */
 
+DROP TABLE IF EXISTS temp.new_vendor;
 
+CREATE TABLE temp.new_vendor AS
 
--- Date
-/*1. Get the customer_id, month, and year (in separate columns) of every purchase in the customer_purchases table.
+SELECT *
 
-HINT: you might need to search for strfrtime modifers sqlite on the web to know what the modifers for month 
-and year are! */
+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 Store', 'Thomas', 'Rental');
 
 
-/* 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. 
+SELECT * FROM new_vendor;
 
-HINTS: you will need to AGGREGATE, GROUP BY, and filter...
-but remember, STRFTIME returns a STRING for your WHERE statement!! */