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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.

Deze oefening maakt deel uit van de cursus

Introduction to Oracle SQL

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Oefeninstructies

  • 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'.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

-- 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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