Question

Let us say that I have a table structured like this(using SQL server):

empID INT
payment INT

Now, each employee only gets paid either 50.00 or 100.00. There are two employees earning 50.00 and three earning 100.00.

How would I do a select statement so that the result set was like this:

50.00   100
-----   -----
2       3

Where 50.00 and 100.00 are the column headers, and the number below are the actual values. I know that I can do

SELECT payment, COUNT(*)
FROM Student
GROUP BY payment

But that returns the payment in its own column. I want each different payment value in its own column.

Answer 1

Here’s how:

select sum(case when payment = 50.00 then 1 else 0 end) as num050,
       sum(case when payment = 100.00 then 1 else 0 end) as num100

But, with floating point numbers, you should never do equal comparisons. It is better to do something like:

sum(case when abs(payment - 50) < 0.001 then 1 else 0 end)

or something like that.