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I came up with the exact solution,except my JOINs are in a different order. Using both my solution and copy pastying this solution I get the same error:
Could someone please shed some light into this? Also, is the "c.difficulty_level = d.difficulty_level" in the WHERE clause neccessary? Isn't that "taken care of" from the JOIN condition?
EDIT: Changing to MySQL resulted in a working code.
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I came up with the exact solution,except my JOINs are in a different order. Using both my solution and copy pastying this solution I get the same error:
Could someone please shed some light into this? Also, is the "c.difficulty_level = d.difficulty_level" in the WHERE clause neccessary? Isn't that "taken care of" from the JOIN condition?
EDIT: Changing to MySQL resulted in a working code.