Assignment two

02_activities/assignments/Assignment2.md

@@ -53,8 +53,106 @@ The store wants to keep customer addresses. Propose two architectures for the CU
 
 **HINT:** search type 1 vs type 2 slowly changing dimensions. 
 
+Overwrite Model is Type 1 and Retain Changes is Type 2
+Overwrite Model is to replace existing model and Retain Changes is keeping and updating existing system.
+
 ```
-Your answer...
+Model for a Small Bookstore
+
+Employee
+employee_id
+first_name
+last_name
+position
+hire_date
+salary
+
+Customer
+customer_id
+first_name
+last_name
+email
+phone
+
+Book
+book_id
+title
+author
+ISBN
+genre
+price
+publication_date
+
+Order
+order_id (PK)
+customer_id (FK → Customer.customer_id)
+employee_id (FK → Employee.employee_id)
+order_date (FK → Date.date_id)
+total_amount
+
+Order_Detail
+order_detail_id (PK)
+order_id (FK → Order.order_id)
+book_id (FK → Book.book_id)
+quantity
+unit_price
+
+Sales
+sale_id (PK)
+order_id (FK → Order.order_id)
+payment_date (FK → Date.date_id)
+payment_type
+amount
+
+Date
+date_id (PK)
+calendar_date
+year
+month
+quarter
+weekday
+is_holiday
+
+Relationships:
+One customer can place many orders.
+One order can have many order_details.
+One book can appear in many order_details.
+One employee processes many orders.
+Date connects to both orders and sales.
+
+Adding Employee Shifts with Morning & Evening Shifts:
+Shift
+shift_id (PK)
+shift_name 
+start_time
+end_time
+
+Employee_Shift 
+employee_id (FK → Employee.employee_id)
+shift_id (FK → Shift.shift_id)
+date_id (FK → Date.date_id)
+
+Overwrite Model 
+customer_id (FK → Customer.customer_id)
+street
+city
+province
+postal_code
+country
+
+History Retention Model
+customer_address_id (PK)
+customer_id (FK → Customer.customer_id)
+street
+city
+province
+postal_code
+country
+effective_date
+end_date
+is_current
+
+Overwrite Model is Type 1 and Retain Changes is Type 2
 ```
 
 ***
@@ -76,9 +174,7 @@ Steps to complete this part of the assignment:
 
 Using the following syntax you create our super cool and not at all needy manager a list:
 ```
-SELECT 
-product_name || ', ' || product_size|| ' (' || product_qty_type || ')'
-FROM product
+
 ```
 
 But wait! The product table has some bad data (a few NULL values). 

02_activities/assignments/assignment2.sql

@@ -20,6 +20,9 @@ The `||` values concatenate the columns into strings.
 Edit the appropriate columns -- you're making two edits -- and the NULL rows will be fixed. 
 All the other rows will remain the same.) */
 
+SELECT 
+  COALESCE(product_name, '') || ', ' || COALESCE(product_size, '') || ' (' || COALESCE(product_qty_type, 'unit') || ')' AS product_details
+FROM product;
 
 
 --Windowed Functions
@@ -32,17 +35,37 @@ each new market date for each customer, or select only the unique market dates p
 (without purchase details) and number those visits. 
 HINT: One of these approaches uses ROW_NUMBER() and one uses DENSE_RANK(). */
 
+SELECT 
+  customer_id,
+  market_date,
+  ROW_NUMBER() OVER (PARTITION BY customer_id ORDER BY market_date) AS visit_number
+FROM customer_purchases;
 
 
 /* 2. Reverse the numbering of the query from a part so each customer’s most recent visit is labeled 1, 
 then write another query that uses this one as a subquery (or temp table) and filters the results to 
 only the customer’s most recent visit. */
 
+WITH ranked AS (
+  SELECT 
+    customer_id,
+    market_date,
+    ROW_NUMBER() OVER (PARTITION BY customer_id ORDER BY market_date DESC) AS rev_visit_number
+  FROM customer_purchases
+)
+SELECT *
+FROM ranked
+WHERE rev_visit_number = 1;
 
 
 /* 3. Using a COUNT() window function, include a value along with each row of the 
 customer_purchases table that indicates how many different times that customer has purchased that product_id. */
 
+SELECT 
+  customer_id,
+  product_id,
+  COUNT(*) OVER (PARTITION BY customer_id, product_id) AS product_purchase_count
+FROM customer_purchases;
 
 
 -- String manipulations
@@ -57,10 +80,18 @@ Remove any trailing or leading whitespaces. Don't just use a case statement for
 
 Hint: you might need to use INSTR(product_name,'-') to find the hyphens. INSTR will help split the column. */
 
+SELECT 
+  product_name,
+  TRIM(SUBSTR(product_name, INSTR(product_name, '-') + 1)) AS description
+FROM product
+WHERE INSTR(product_name, '-') > 0;
 
 
 /* 2. Filter the query to show any product_size value that contain a number with REGEXP. */
 
+SELECT *
+FROM product
+WHERE product_size REGEXP '[0-9]';
 
 
 -- UNION
@@ -73,6 +104,33 @@ HINT: There are a possibly a few ways to do this query, but if you're struggling
 3) Query the second temp table twice, once for the best day, once for the worst day, 
 with a UNION binding them. */
 
+WITH sales_per_day AS (
+    SELECT 
+        market_date,
+        SUM(quantity * cost_to_customer_per_qty) AS total_sales
+    FROM customer_purchases
+    GROUP BY market_date
+),
+ranked AS (
+    SELECT 
+        market_date,
+        total_sales,
+        RANK() OVER (ORDER BY total_sales DESC) AS best_rank,
+        RANK() OVER (ORDER BY total_sales ASC)  AS worst_rank
+    FROM sales_per_day
+)
+-- Best Day
+SELECT market_date, total_sales, 'Best Day' AS label
+FROM ranked
+WHERE best_rank = 1
+
+UNION
+
+-- Worst Day
+SELECT market_date, total_sales, 'Worst Day' AS label
+FROM ranked
+WHERE worst_rank = 1;
+
 
 
 
@@ -89,6 +147,31 @@ Think a bit about the row counts: how many distinct vendors, product names are t
 How many customers are there (y). 
 Before your final group by you should have the product of those two queries (x*y).  */
 
+WITH customer_count AS (
+    SELECT COUNT(*) AS num_customers
+    FROM customer
+)
+, vendor_products AS (
+    SELECT 
+        v.vendor_id,
+        v.vendor_name,
+        p.product_id,
+        p.product_name,
+        vi.original_price
+    FROM vendor_inventory vi
+    JOIN vendor v ON vi.vendor_id = v.vendor_id
+    JOIN product p ON vi.product_id = p.product_id
+    GROUP BY v.vendor_id, v.vendor_name, p.product_id, p.product_name, vi.original_price
+)
+
+SELECT 
+    vp.vendor_name,
+    vp.product_name,
+    SUM(5 * vp.original_price) AS total_revenue_per_product
+FROM vendor_products vp
+CROSS JOIN customer_count cc
+GROUP BY vp.vendor_name, vp.product_name
+ORDER BY vp.vendor_name, vp.product_name;
 
 
 -- INSERT
@@ -97,18 +180,32 @@ This table will contain only products where the `product_qty_type = 'unit'`.
 It should use all of the columns from the product table, as well as a new column for the `CURRENT_TIMESTAMP`.  
 Name the timestamp column `snapshot_timestamp`. */
 
+DROP TABLE IF EXISTS product_units;
+
+CREATE TABLE product_units AS
+SELECT p.*,
+       CURRENT_TIMESTAMP AS snapshot_timestamp
+FROM product p
+WHERE p.product_qty_type = 'unit';
 
 
 /*2. Using `INSERT`, add a new row to the product_units table (with an updated timestamp). 
 This can be any product you desire (e.g. add another record for Apple Pie). */
 
+INSERT INTO product_units
+SELECT *, CURRENT_TIMESTAMP
+FROM product
+WHERE product_name = 'Apple Pie';
 
 
 -- DELETE
 /* 1. Delete the older record for the whatever product you added. 
 
 HINT: If you don't specify a WHERE clause, you are going to have a bad time.*/
 
+DELETE FROM product_units
+WHERE product_name = 'Apple Pie'
+AND snapshot_timestamp = (SELECT MIN(snapshot_timestamp) FROM product_units WHERE product_name = 'Apple Pie');
 
 
 -- UPDATE
@@ -128,6 +225,21 @@ Finally, make sure you have a WHERE statement to update the right row,
 	you'll need to use product_units.product_id to refer to the correct row within the product_units table. 
 When you have all of these components, you can run the update statement. */
 
+ALTER TABLE product_units ADD COLUMN current_quantity INTEGER DEFAULT 0;
+
+UPDATE product_units
+SET current_quantity = (
+  SELECT COALESCE(vi.quantity, 0)
+  FROM vendor_inventory vi
+  WHERE vi.product_id = product_units.product_id
+  ORDER BY vi.market_date DESC
+  LIMIT 1
+)
+WHERE EXISTS (
+  SELECT 1
+  FROM vendor_inventory vi
+  WHERE vi.product_id = product_units.product_id
+);
 
 
 

02_activities/assignments/farmersmarket.sqbpro

@@ -1 +1 @@
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+<?xml version="1.0" encoding="UTF-8"?><sqlb_project><db path="C:/Users/Asad/dsi_day2/SQL1/05_src/sql/farmersmarket.db" readonly="0" foreign_keys="1" case_sensitive_like="0" temp_store="0" wal_autocheckpoint="1000" synchronous="2"/><attached/><window><main_tabs open="structure browser pragmas query" current="3"/></window><tab_structure><column_width id="0" width="300"/><column_width id="1" width="0"/><column_width id="2" width="100"/><column_width id="3" width="8651"/><column_width id="4" width="0"/><expanded_item id="0" parent="1"/><expanded_item id="1" parent="1"/><expanded_item id="2" parent="1"/><expanded_item id="3" parent="1"/><expanded_item id="4" parent="1"/></tab_structure><tab_browse><table title="product" custom_title="0" dock_id="3" table="4,7:mainproduct"/><dock_state 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filename="C:/Users/Asad/dsi_day2/SQL1/02_activities/assignments/assignment2.sql">-- Reference to file &quot;C:/Users/Asad/dsi_day2/SQL1/02_activities/assignments/assignment2.sql&quot; (not supported by this version) --</sql><current_tab id="1"/></tab_sql></sqlb_project>