SQL 2 counts with different filter

Question

I have a table and I need calculate two aggregate functions with different conditions in one statement. How can I do this?

Pseudocode below:

SELECT c         


        

Answer 1

It is possible to do this in one select statement.

The way I've done it before is like this:

SELECT SUM(CASE WHEN ColumnA < 0 THEN 1 END) AS LessThanZero, 
       SUM(CASE WHEN ColumnA > 0 THEN 1 END) AS GreaterThanZero
FROM dbo.TableA 

This is the correct MS SQL syntax and I believe this is a very efficient way of doing it.

Don't forget you are not covering the case when ColumnA = 0!