MySQL IFNULL on 4 or 5 columns

I have a statement that is:

ORDER BY IFNULL(rrp, wholesale) ASC

...but I wanted to know if there开发者_如何学Python is a way to have an IFNULL statement that checks 3 or 4 or 5 columns? All from the same table.

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Use COALESCE

e.g:

SELECT ....
  FROM ....
ORDER BY COALESCE(rrp, wholesale, column3, column4)

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You could chain them up, so the expression picks the first not-null value from a list of columns:

ORDER BY IFNULL(IFNULL(IFNULL(rrp, wholesale), some_column), some_other_column) ASC

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Try using COALESCE; it may give you what you need.