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What is a CTE (Common Table Expression), and how is it different from a subquery?
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Answer Posted / hr@tgksolutions.com
• CTE: Temporary result set defined using WITH and reusable within the query. Improves readability for complex queries.
• Subquery: Nested query executed each time it is called. Example:
WITH SalesCTE AS (
SELECT employee_id, SUM(sales) AS total_sales
FROM sales
GROUP BY employee_id
)
SELECT * FROM SalesCTE WHERE total_sales > 5000;
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