solution

task.sql

@@ -1,11 +1,26 @@
--- Use our database
-USE ShopDB; 
+-- 1. Switch to the correct database
+USE ShopDB;
 
--- Some data should be created outside the transaction (here)
+-- 2. Create a new empty order for Customer ID 1
+INSERT INTO Orders (CustomerID, Date) 
+VALUES (1, '2023-01-01');
 
--- Start the transaction 
-START TRANSACTION; 
+-- 3. Get the ID of the order we just created and save it into a variable
+SET @NewOrderID = LAST_INSERT_ID();
 
--- And some data should be created inside the transaction 
+-- 4. START THE TRANSACTION
+-- We group the stock update and the order item creation together
+START TRANSACTION;
 
-COMMIT; 
+    -- Step A: Decrease the warehouse stock for AwersomeProduct (ID: 1) by 1
+    UPDATE Products 
+    SET WarehouseAmount = WarehouseAmount - 1 
+    WHERE ID = 1;
+
+    -- Step B: Add AwersomeProduct to the OrderItems table
+    INSERT INTO OrderItems (OrderID, ProductID, Count) 
+    VALUES (@NewOrderID, 1, 1);
+
+-- 5. COMMIT THE TRANSACTION
+-- This permanently saves both changes to the database at the exact same time
+COMMIT;