Question

I need a query to Count distinct results…

My Table

ID | stats | name
-----------------
1  | 1     | John
2  | 1     | John
3  | 2     | John
4  | 2     | John
5  | 3     | John

i need query like this….

SELECT if( stats = 2, ADD + 1, 0) as ok, if(stats = 3, ADD + 1, 0) as no_ok

Thanks.

Answer 1

If you want to simultaneously count the number of rows with multiple specific criteria in a data set, you can use the pattern COUNT(CASE WHEN criteria THEN 1 END). Here’s an example that counts the number of rows for stats = 2, and for stats = 3:

SELECT
  count(case when stats = 2 then 1 end) as ok,
  count(case when stats = 3 then 1 end) as not_ok
from
  Table1

Results:

OK | NOT_OK
-----------
2  | 1

Demo: http://www.sqlfiddle.com/#!2/82414/1