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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.

Este exercício faz parte do curso

Introduction to Oracle SQL

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Instruções do exercício

  • 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'.

Exercício interativo prático

Experimente este exercício completando este código de exemplo.

-- 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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