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Consider the following SQL code:
BEGIN TRANSACTION;
SELECT SUM(Quantity) FROM OrderDetails WHERE OrderID = 1;
UPDATE Orders SET TotalQuantity = <result of the previous query> WHERE OrderID = 1;
COMMIT;
Which of the following ACID properties does this code violate?
  • a)
    Atomicity
  • b)
    Consistency
  • c)
    Isolation
  • d)
    Durability
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following SQL code:BEGIN TRANSACTION;SELECT SUM(Quantity)...
The code violates the Consistency property because it calculates the sum of Quantity from the OrderDetails table and updates the TotalQuantity in the Orders table based on that value. However, if other transactions modify the OrderDetails table before the UPDATE statement, it may result in inconsistent TotalQuantity values.
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Question Description
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