NTT Data SQL Senior Data Engineer Interview Questions and Answers | SQL Interview Preparation 2025
NTT DATA Senior Data Engineer Interview Question and Answer | Tips & Tricks Covered
Create Statement :
================
--Task : Detect strictly decreasing qty for any rolling 3-month window.
CREATE TABLE monthly_sales (product_id INT, year_month DATE, qty INT);
INSERT INTO monthly_sales VALUES
(1,'2025-06-01',100),(1,'2025-07-01',90),(1,'2025-08-01',80), -- declining
(2,'2025-06-01',50),(2,'2025-07-01',60),(2,'2025-08-01',55);
--input
select *
from monthly_sales;
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