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  1. Prepare
  2. SQL
  3. Advanced Select
  4. Occupations
  5. Discussions

Occupations

  • ricofebrian_work
     + 0 comments

    My solutions (MySQL). hope it helps!

    First approach: using CTE

    WITH occupation_rank AS (
        SELECT
                name,
                occupation,
                ROW_NUMBER() OVER(PARTITION BY occupation ORDER BY name ASC) as rn
        FROM occupations
)
SELECT
        MAX(CASE WHEN occupation = 'Doctor' THEN name END) AS doctor_names,
        MAX(CASE WHEN occupation = 'Professor' THEN name END) AS professor_names,
        MAX(CASE WHEN occupation = 'Singer' THEN name END) AS singer_names,
        MAX(CASE WHEN occupation = 'Actor' THEN name END) AS actor_names 
FROM occupation_rank
GROUP BY rn
ORDER BY rn;

    Second approach: using subquery

    SELECT
        MAX(CASE WHEN occupation = 'Doctor' THEN name END) AS doctor_names,
        MAX(CASE WHEN occupation = 'Professor' THEN name END) AS professor_names,
        MAX(CASE WHEN occupation = 'Singer' THEN name END) AS singer_names,
        MAX(CASE WHEN occupation = 'Actor' THEN name END) AS actor_names
FROM (
        SELECT
                name,
                occupation,
                ROW_NUMBER() OVER (PARTITION BY occupation ORDER BY name) as rn
        FROM OCCUPATIONS
) AS sorted
GROUP BY rn;