SELECT
    string_agg(title, ', ')
    FROM
      film
    WHERE
      title LIKE 'AN%'
    HAVING
      count(*) > 5


"Return a concatenation of all the films starting with "AN", *IF* there are at least 5 such films."

Where in the statement does it say that the rows should be grouped by their title column?
To be more specific what does GROUP BY() mean?
I would understand the statement better if it would have GROUP BY(title).

- Rami

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