Challenge: Rating of Singers
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Create a rating of the singers: from singer with the biggest average Song's price to the smallest one. Output the singer's name (naming) and avearge price (price) of his/her songs.
Løsning
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SELECT singers.naming, AVG(songs.price)
FROM singers
INNER JOIN songs
ON songs.singer_id = singers.id
GROUP BY singers.id
ORDER BY AVG(songs.price) DESC
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Sektion 3. Kapitel 3
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