Assignment one

02_activities/assignments/assignment1.sql

@@ -5,20 +5,29 @@
 --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. */
 -- option 1
-
+SELECT  *
+FROM customer_purchases
+WHERE 
+    product_id = 4 or product_id = 9;
+
 
 -- option 2
-
+SELECT  *
+FROM customer_purchases
+WHERE 
+    product_id IN (4, 9);
 
 
 /*2. Write a query that returns all customer purchases and a new calculated column 'price' (quantity * cost_to_customer_per_qty), 
@@ -27,10 +36,22 @@ filtered by vendor IDs between 8 and 10 (inclusive) using either:
 	2.  one condition using BETWEEN
 */
 -- option 1
+SELECT  *
+,(quantity * cost_to_customer_per_qty) AS price
+FROM 
+    customer_purchases cp
+WHERE 
+    cp.vendor_id >= 8 
+    AND cp.vendor_id <= 10;
 
 
 -- option 2
-
+SELECT  *
+,(quantity * cost_to_customer_per_qty) AS price
+FROM 
+    customer_purchases cp
+WHERE 
+    cp.vendor_id BETWEEN 8 AND 10;
 
 
 --CASE
@@ -39,19 +60,45 @@ 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'
+When product_qty_type in ('lbs', 'oz')  then 'bulk'
+When product_qty_type is null THEN NULL
+ELSE NULL
+END as prod_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'
+When product_qty_type in ('lbs', 'oz')  then 'bulk'
+When product_qty_type is null THEN NULL
+ELSE NULL
+END as prod_qty_type_condensed
+, CASE
+when lower (product_name) like '%pepper%' THEN 1
+ELSE 0
+END AS PEPPER_FLAD
+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 v
+INNER JOIN 
+    vendor_booth_assignments vba ON v.vendor_id = vba.vendor_id
+ORDER BY 
+    v.vendor_name, vba.market_date;
 
 
 /* SECTION 3 */
@@ -60,14 +107,35 @@ 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 booth_rented
+FROM 
+vendor_booth_assignments
+GROUP by 1;
 
 /* 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 
+c.customer_first_name
+,c.customer_last_name
+
+FROM (
+SELECT customer_id
+, sum ((quantity * cost_to_customer_per_qty)) as total_spent
+
+FROM customer_purchases
+GROUP by 1
+HAVING total_spent > 2000
+) TS
+
+left JOIN customer c
+on ts.customer_id = c.customer_id
+ORDER by customer_first_name, customer_last_name;
 
 
 --Temp Table
@@ -82,14 +150,28 @@ When inserting the new vendor, you need to appropriately align the columns to be
 VALUES(col1,col2,col3,col4,col5) 
 */
 
+CREATE TEMP TABLE new_vendor AS
+
+SELECT *
+from vendor;
+
+INSERT into new_vendor
+VALUES (10, "Thomass Superfood store", "'a Fresh Focused store", "Thomas",  "Rosenthal");
 
+SELECT *
+FROM new_vendor;
 
 -- Date
 /*1. Get the customer_id, month, and year (in separate columns) of every purchase in the customer_purchases table.
 
 HINT: you might need to search for strfrtime modifers sqlite on the web to know what the modifers for month 
 and year are! */
 
+SELECT
+customer_id
+, strftime ('%m', market_date) as month
+, strftime ('%Y', market_date) as year
+from customer_purchases;
 
 
 /* 2. Using the previous query as a base, determine how much money each customer spent in April 2022. 
@@ -98,3 +180,18 @@ Remember that money spent is quantity*cost_to_customer_per_qty.
 HINTS: you will need to AGGREGATE, GROUP BY, and filter...
 but remember, STRFTIME returns a STRING for your WHERE statement!! */
 
+SELECT
+customer_id
+, month
+, year
+, sum (price) as monthly_spent
+
+FROM (
+SELECT customer_id
+, strftime ('%m', market_date) as month
+, strftime ('%Y', market_date) as year
+, (quantity * cost_to_customer_per_qty) as price
+from customer_purchases
+) tl
+
+GROUP  by 1,2,3;