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Author: huseyincenik

Projects/ 8_Week_SQL_Challenge/Case_Study_2/Diagram_0.txt

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+-- Information
+
+---All column names in my view are underlined in red in SSMS
+---Or, using the menu: Edit -> IntelliSense -> Refresh Local Cache
+
+/*To change the Prevent saving changes that require the table re-creation option, follow these steps:
+
+Open SQL Server Management Studio.
+
+On the Tools menu, click Options.
+
+In the navigation pane of the Options window, click Designers.
+
+Select or clear the Prevent saving changes that require the table re-creation check box, and then click OK. */
+
+
+USE pizza_runner;
+
+SELECT
+	*
+FROM
+	pizza_runner.pizza_recipes;
+
+-- Question 1) How many pizzas were ordered?
+
+SELECT
+	COUNT(order_id) AS count_of_pizzas
+FROM
+	pizza_runner.customer_orders;
+--Answer = 14
+
+-- Question 2) How many unique customer orders were made?
+
+SELECT
+	COUNT(DISTINCT A.customer_id) AS count_of_customer
+FROM
+	pizza_runner.customer_orders AS A;
+--Answer = 5
+
+
+-- Question 3) How many successful orders were delivered by each runner?
+
+SELECT
+	runner_id,
+	COUNT(*) AS succesful_orders
+FROM
+	pizza_runner.runner_orders

Projects/ 8_Week_SQL_Challenge/Case_Study_2/Solution.sql

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+CREATE DATABASE pizza_runner;
+USE pizza_runner;
+
+CREATE SCHEMA pizza_runner;
+--SET search_path = pizza_runner;
+
+DROP TABLE IF EXISTS pizza_runner.runners;
+CREATE TABLE pizza_runner.runners (
+  "runner_id" INTEGER,
+  "registration_date" DATE
+);
+
+INSERT INTO pizza_runner.runners ("runner_id", "registration_date") VALUES
+  (1, '2021-01-01'),
+  (2, '2021-01-03'),
+  (3, '2021-01-08'),
+  (4, '2021-01-15');
+
+DROP TABLE IF EXISTS pizza_runner.customer_orders;
+CREATE TABLE pizza_runner.customer_orders (
+  "order_id" INTEGER,
+  "customer_id" INTEGER,
+  "pizza_id" INTEGER,
+  "exclusions" VARCHAR(4),
+  "extras" VARCHAR(4),
+  "order_time" DATETIME
+);
+
+INSERT INTO pizza_runner.customer_orders ("order_id", "customer_id", "pizza_id", "exclusions", "extras", "order_time") VALUES
+  (1, 101, 1, '', '', '2020-01-01 18:05:02'),
+  (2, 101, 1, '', '', '2020-01-01 19:00:52'),
+  (3, 102, 1, '', '', '2020-01-02 23:51:23'),
+  (3, 102, 2, '', NULL, '2020-01-02 23:51:23'),
+  (4, 103, 1, '4', '', '2020-01-04 13:23:46'),
+  (4, 103, 1, '4', '', '2020-01-04 13:23:46'),
+  (4, 103, 2, '4', '', '2020-01-04 13:23:46'),
+  (5, 104, 1, 'null', '1', '2020-01-08 21:00:29'),
+  (6, 101, 2, 'null', 'null', '2020-01-08 21:03:13'),
+  (7, 105, 2, 'null', '1', '2020-01-08 21:20:29'),
+  (8, 102, 1, 'null', 'null', '2020-01-09 23:54:33'),
+  (9, 103, 1, '4', '1, 5', '2020-01-10 11:22:59'),
+  (10, 104, 1, 'null', 'null', '2020-01-11 18:34:49'),
+  (10, 104, 1, '2, 6', '1, 4', '2020-01-11 18:34:49');
+
+DROP TABLE IF EXISTS pizza_runner.runner_orders;
+CREATE TABLE pizza_runner.runner_orders (
+  "order_id" INTEGER,
+  "runner_id" INTEGER,
+  "pickup_time" VARCHAR(19),
+  "distance" VARCHAR(7),
+  "duration" VARCHAR(10),
+  "cancellation" VARCHAR(23)
+);
+
+INSERT INTO pizza_runner.runner_orders ("order_id", "runner_id", "pickup_time", "distance", "duration", "cancellation") VALUES
+  (1, 1, '2020-01-01 18:15:34', '20km', '32 minutes', ''),
+  (2, 1, '2020-01-01 19:10:54', '20km', '27 minutes', ''),
+  (3, 1, '2020-01-03 00:12:37', '13.4km', '20 mins', NULL),
+  (4, 2, '2020-01-04 13:53:03', '23.4', '40', NULL),
+  (5, 3, '2020-01-08 21:10:57', '10', '15', NULL),
+  (6, 3, NULL, NULL, NULL, 'Restaurant Cancellation'),
+  (7, 2, '2020-01-08 21:30:45', '25km', '25mins', NULL),
+  (8, 2, '2020-01-10 00:15:02', '23.4 km', '15 minute', NULL),
+  (9, 2, NULL, NULL, NULL, 'Customer Cancellation'),
+  (10, 1, '2020-01-11 18:50:20', '10km', '10minutes', NULL);
+
+DROP TABLE IF EXISTS pizza_runner.pizza_names;
+CREATE TABLE pizza_runner.pizza_names (
+  "pizza_id" INTEGER,
+  "pizza_name" TEXT
+);
+
+INSERT INTO pizza_runner.pizza_names ("pizza_id", "pizza_name") VALUES
+  (1, 'Meatlovers'),
+  (2, 'Vegetarian');
+
+DROP TABLE IF EXISTS pizza_runner.pizza_recipes;
+CREATE TABLE pizza_runner.pizza_recipes (
+  "pizza_id" INTEGER,
+  "toppings" TEXT
+);
+
+INSERT INTO pizza_runner.pizza_recipes ("pizza_id", "toppings") VALUES
+  (1, '1, 2, 3, 4, 5, 6, 8, 10'),
+  (2, '4, 6, 7, 9, 11, 12');
+
+DROP TABLE IF EXISTS pizza_runner.pizza_toppings;
+CREATE TABLE pizza_runner.pizza_toppings (
+  "topping_id" INTEGER,
+  "topping_name" TEXT
+);
+
+INSERT INTO pizza_runner.pizza_toppings ("topping_id", "topping_name") VALUES
+  (1, 'Bacon'),
+  (2, 'BBQ Sauce'),
+  (3, 'Beef'),
+  (4, 'Cheese'),
+  (5, 'Chicken'),
+  (6, 'Mushrooms'),
+  (7, 'Onions'),
+  (8, 'Pepperoni'),
+  (9, 'Peppers'),
+  (10, 'Salami'),
+  (11, 'Tomatoes'),
+  (12, 'Tomato Sauce');