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COUNTIF 1

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The problem is, how do I do this for multiple colums.
I have 13 columns - M1 -> M13 (these represent 13 months).
How would I count an occurence of non null data across these colums (for each row).
ie:
M1 NULL
M2 NULL
M3 12
M4 NULL
M5 6
M7 NULL

ETC...
I would like the value 2 returned (2 occurences of non-null data)
Hope you can understand what i am attempting
 
Code:
SELECT
  CASE WHEN m1 IS NULL THEN 0 ELSE 1 END +
  CASE WHEN m2 IS NULL THEN 0 ELSE 1 END +
  CASE WHEN m3 IS NULL THEN 0 ELSE 1 END +
  ...
  CASE WHEN m13 IS NULL THEN 0 ELSE 1 END
FROM tbl

--James
 
In a similar vein, i would also like to find the LAST month ordered:
Example Data:
M1 NULL
M2 NULL
M3 NULL
M4 NULL
M5 6
M7 3
M8 NULL
M9 10
M10 NULL
M11 NULL
M12 NULL

These are column headings so in the above example, i would like to have '4' returned - ie LAST ORDERED 4 MONTHS AGO (M9 has last order qty in it)
 
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