Php，MySql，单个查询有两个计数

Question

I need to perform two different counts in one single query.

First Query: count number of transactions from today 30 days back.
Second Query: count number of transactions from last 60 until last 30 days.

I have first query working fine as:

SELECT 
  COUNT(*) AS sales 
FROM
  transactions 
WHERE DATE(created) > DATE_SUB(NOW(), INTERVAL 30 DAY) 
  AND STATUS = 1;

How can I incorporate the second query into the above?

Answer 1

You can use COUNT and CASE WHEN :

SELECT 
  COUNT(CASE WHEN DATE(created) > DATE_SUB(NOW(), INTERVAL 30 DAY) THEN 1 END) AS c1,
  COUNT(CASE WHEN DATE(created) <= DATE_SUB(NOW(), INTERVAL 30 DAY) THEN 1 END) AS c2
FROM transactions 
WHERE DATE(created) > DATE_SUB(NOW(), INTERVAL 60 DAY) 
  AND STATUS = 1;

or UNION :

SELECT COUNT(*) AS sales 
FROM transactions 
WHERE DATE(created) > DATE_SUB(NOW(), INTERVAL 30 DAY) 
  AND STATUS = 1
UNION ALL
SELECT COUNT(*) 
FROM transactions 
WHERE DATE(created) > DATE_SUB(NOW(), INTERVAL 60 DAY) 
  AND DATE(created) < DATE_SUB(NOW(), INTERVAL 30 DAY) 
  AND STATUS = 1