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Solution 1.0.0 #162

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7b0eeb1
Solution 1.0.0
Aisengrim Mar 17, 2026
fc9d5ff
Solution 1.1.0
Aisengrim Mar 17, 2026
3a0b435
Solution 2.0.0
Aisengrim Mar 17, 2026
fb57785
Solution 2.1.0
Aisengrim Mar 17, 2026
d6fab5b
Solution 2.2.0
Aisengrim Mar 17, 2026
4e3faab
Solution 3.0.0
Aisengrim Mar 17, 2026
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20 changes: 13 additions & 7 deletions task.sql
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Original file line number Diff line number Diff line change
@@ -1,11 +1,17 @@
-- Use our database
USE ShopDB;
USE ShopDB;

-- Some data should be created outside the transaction (here)
INSERT INTO Orders (CustomerID, Date)
VALUES (1, '2023-01-01');

-- Start the transaction
START TRANSACTION;
SET @order_id = LAST_INSERT_ID();

-- And some data should be created inside the transaction
START TRANSACTION;
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@mateacademy-ai-mentor mateacademy-ai-mentor Mar 17, 2026

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This transaction should begin before the INSERT INTO Orders statement on line 3. Creating an order, adding an item, and updating stock are all parts of a single business operation. To ensure data integrity (i.e., to avoid creating an empty order if adding an item fails), all these steps should be inside the same transaction.


COMMIT;
INSERT INTO OrderItems (OrderID, ProductID, Count)
VALUES (@order_id, 1, 1);

UPDATE Products
SET WarehouseAmount = WarehouseAmount - 1
WHERE ID = 1;

COMMIT;
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