How to combine these three queries?

[whitemank]

I'm currently using three separate queries to get the data I need out of this table. I know there is a way to do a single query... I just can't seem to figure out what that way is... Anyone?

SELECT COUNT(tracking_number) as dase 
FROM billing 
WHERE user_id = $user_id
  AND charge_description_code = 'LDR'
  AND invoice_date BETWEEN '$start_date' AND '$end_date'

SELECT COUNT(tracking_number) as total
FROM billing 
WHERE user_id = $user_id
  AND package_quantity>0
  AND invoice_date BETWEEN '$start_date' AND '$end_date'

SELECT COUNT(tracking_number) as das
FROM billing 
WHERE user_id = $user_id
  AND charge_description_code = 'RDR'
  AND invoice_date BETWEEN '$start_date' AND '$end_date'

[r937]

SELECT COUNT(CASE WHEN charge_description_code = 'LDR'
                  THEN tracking_number END) AS dase
     , COUNT(CASE WHEN package_quantity>0
                  THEN tracking_number END) AS total
     , COUNT(CASE WHEN charge_description_code = 'RDR'
                  THEN tracking_number END) AS das
  FROM billing 
 WHERE user_id = $user_id
   AND invoice_date BETWEEN '$start_date' AND '$end_date'