1779. Running revenue — Hospital — implementation variant 29

DBMS Published 30 Sept 2026 Updated 30 Sept 2026 0 Views Verified

In a Hospital application, implement this production problem: Calculate a running completed revenue total by order date. The API/service receives user input and must return or modify data safely. Give the SQL solution, explain why it works, and show how the same operation is called from the selected stack.

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Answer & Explanation

4 Answers

Verified

Option A

DELETE FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified

Option B

SELECT * FROM the_table;

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.

Verified Correct Answer

Option C

SELECT id,order_date,total_amount,SUM(total_amount) OVER(ORDER BY order_date,id) running_revenue FROM orders WHERE status='completed';

Additional Explanation

The window SUM keeps individual rows while accumulating a running total.

Verified

Option D

UPDATE the_table SET status='active';

Additional Explanation

Incorrect: it does not implement the stated business rule and may modify/fetch the wrong rows.