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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.

Cet exercice fait partie du cours

Introduction to Oracle SQL

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Instructions

  • 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'.

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

-- 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
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