Assignment two completed

02_activities/assignments/Assignment2.md

@@ -54,7 +54,8 @@ The store wants to keep customer addresses. Propose two architectures for the CU
 **HINT:** search type 1 vs type 2 slowly changing dimensions. 
 
 ```
-Your answer...
+Type 1: Overwrites the address, retaining only the latest value (no historical data).
+Type 2: Retains a historical record of all address changes, tracking them with effective dates.
 ```
 
 ***

02_activities/assignments/assignment1.sql

@@ -4,21 +4,25 @@
 
 --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), 
@@ -27,9 +31,15 @@ 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  
+where vendor_id between 8 and 10;
 
 
 -- option 2
+select *, (quantity * cost_to_customer_per_qty) as price 
+from customer_purchases  
+where vendor_id >= 8 and vendor_id <= 10;
 
 
 
@@ -38,27 +48,46 @@ filtered by vendor IDs between 8 and 10 (inclusive) using either:
 Using the product table, write a query that outputs the product_id and product_name
 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 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'
+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 v join vendor_booth_assignments vba 
+on v.vendor_id = vba.vendor_id
+order by v.vendor_name, vba.market_date;
 
 
 /* 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. */
+select v.vendor_name, v.vendor_id, count(vba.booth_number) as number_of_booths
+from vendor v join vendor_booth_assignments vba 
+on v.vendor_id = vba.vendor_id
+group by v.vendor_id
+order by v.vendor_name, vba.market_date;
 
 
 
@@ -67,7 +96,18 @@ sticker to everyone who has ever spent more than $2000 at the market. Write a qu
 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. */
-
+with cte as (
+select c.customer_id, c.customer_first_name, c.customer_last_name,
+(cp.quantity * cp.cost_to_customer_per_qty) as price
+from customer c join customer_purchases cp
+on c.customer_id = cp.customer_id
+) select customer_id,
+customer_first_name, customer_last_name,
+sum(price) as total_money_spent
+from cte
+group by customer_id
+having sum(price)  > 2000
+order by customer_last_name, customer_first_name;
 
 
 --Temp Table
@@ -81,15 +121,23 @@ When inserting the new vendor, you need to appropriately align the columns to be
 -> To insert the new row use VALUES, specifying the value you want for each column:
 VALUES(col1,col2,col3,col4,col5) 
 */
+create temp table new_vendor as
+select * from vendor;
 
+select * from new_vendor;
+
+insert into new_vendor values(10, 'Thomass Superfood Store', 'Fresh Focused', 'Thomas', 'Rosenthal');
 
 
 -- 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,
+strfrtime('%m', market_date) as month,
+strfrtime('%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 +146,15 @@ 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!! */
 
+with cte as (
+select *,
+(quantity * cost_to_customer_per_qty) as price,
+strftime('%m', market_date) as month,
+strftime('%Y', market_date) as year
+from customer_purchases
+)
+select customer_id, month, year,
+sum(price) as total_april_spent
+from cte 
+where month = '04' and year = '2022'
+group by customer_id