Question

I am having a problem using multiple And‘s in a Case statement.

My Database looks like:

Enrollment      Paperless      Validated
0               1              0
1               0              1
0               1              0
1               1              1
0               0              0
0               1              0
0               0              0
0               1              0
1               1              1
0               1              0

So my query looks like this:

Select
    Count(case when [Enrollment] = 1 and [Paperless] = 1 and [Validated] = 1 then 1 else 0 end) as [Paperless]
    ,Count(case when [Enrollment] = 1 and [Paperless] = 1 and [Validated] = 1 then 1 else 0 end) as [Online_Only]
    ,Count(*) as "Total"
FROM [my_table]

Sql Fiddle: http://sqlfiddle.com/#!3/61202/5

As you can see from the sql fiddle the count is always 20 in the case statements when they should be different. Am I just doing something wrong in my case statement or do i have to do them in sub-queries?

Dave

Answer 1

COUNT returns true regardless of the actual value. So use:

SUM(CASE ...)

instead of

COUNT(CASE ...)