Php，MySql，兩個計數的單個查詢

Question

我需要在一個查詢中執行兩個不同的計數。

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

我第一次查詢工作的罰款：

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

我如何可以將第二查詢到上面？

Answer 1

您可以使用COUNT和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; 

或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