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Comparing values

eSymphony has asked you to look into the differences between composer and artist name. More specifically, they want to know for which Queen tracks these differ. If they are the same a NULL value should appear, and if they differ the artist name should be displayed. This is obviously no challenge for you since you know all about null-related functions.

Questo esercizio fa parte del corso

Introduction to Oracle SQL

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Istruzioni dell'esercizio

  • Display NULL if the artist name and composer are the same and the artist name if they differ.
  • Filter on rows where the artist name is 'Queen'.

Esercizio pratico interattivo

Prova a risolvere questo esercizio completando il codice di esempio.

-- Use the correct null-related function
SELECT t.Name, ar.Name, t.Composer, ___(___, ___)
FROM Track t INNER JOIN Album a 
	ON t.AlbumId = a.AlbumId
	INNER JOIN Artist ar
	ON a.ArtistId = ar.ArtistId
-- Filter on artist name Queen
WHERE ___ = '___'
ORDER BY 3
Modifica ed esegui il codice