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Crucial Exams

CompTIA Data+ DA0-002 (V2) Practice Question

During initial data exploration, you load a 50,000-row CSV of customer records into a staging table named customers_stg. Each customer is supposed to be unique by the email column. You need a quick query that lists only the email addresses that appear more than once and shows how many times each one occurs so you can estimate the scope of duplication before cleansing. Which SQL statement meets this requirement?

  • SELECT DISTINCT email FROM customers_stg;

  • SELECT * FROM customers_stg WHERE email IS NULL;

  • SELECT email, COUNT() AS dup_count FROM customers_stg GROUP BY email HAVING COUNT() > 1;

  • SELECT email, COUNT(*) FROM customers_stg GROUP BY email;

CompTIA Data+ DA0-002 (V2)
Data Acquisition and Preparation
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