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Crucial Exams

CompTIA Data+ DA0-002 (V2) Practice Question

A retail company maintains a SQL Server database that includes a table named Projects with the columns project_id (primary key), project_name, dept_id, and budget. Management wants a list of every project whose budget is greater than the average project budget within the same department, generated in a single query without creating any temporary objects. Which SQL statement meets the requirement by using a nested query?

  • SELECT project_name
FROM Projects
WHERE budget > (
    SELECT AVG(budget)
    FROM Projects
);

  • SELECT project_name
FROM Projects p
WHERE p.budget > (
    SELECT AVG(budget)
    FROM Projects
    WHERE dept_id = p.dept_id
);

  • SELECT project_name
FROM Projects p
WHERE (
    SELECT AVG(budget)
    FROM Projects
    WHERE dept_id = p.dept_id
) > p.budget;

  • SELECT p.project_name
FROM Projects p
JOIN (
  SELECT dept_id, AVG(budget) AS avg_budget
  FROM Projects
  GROUP BY dept_id
) a  ON p.dept_id = a.dept_id
WHERE p.budget < a.avg_budget;
CompTIA Data+ DA0-002 (V2)
Data Acquisition and Preparation
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