Question

I have the following CASE expression and the ISNULL portion is not registering:

CASE WHEN IsNull(2010) THEN 0 END) * 
CASE WHEN IsNumeric([Dur_In_Hours]) = 1 THEN 
  CAST([Dur_In_Hours] AS FLOAT) ELSE 0 END) AS Cost

Answer 1

Unfortunately, you are using the IsNull() function wrong. If you are testing if a column is null then you will use:

CASE 
  WHEN 2010 is null 
  THEN 0 
END 
* 
CASE 
  WHEN IsNumeric([Dur_In_Hours]) =1 
  THEN CAST([Dur_In_Hours] AS FLOAT) 
  ELSE 0 
END AS Cost

If you want to use IsNull() then you can use IsNull([2010], 0) to replace that CASE expression:

IsNull([2010], 0)
* 
CASE 
  WHEN IsNumeric([Dur_In_Hours]) =1 
  THEN CAST([Dur_In_Hours] AS FLOAT) 
  ELSE 0 
END AS Cost

Or you can use COALESCE to replace the first CASE:

COALESCE([2010], 0)
* 
CASE 
  WHEN IsNumeric([Dur_In_Hours]) =1 
  THEN CAST([Dur_In_Hours] AS FLOAT) 
  ELSE 0 
END AS Cost