MYSQL_一条语句中COUNT出不同的条件

//利用在一条语句中count出不同的条件,记录一下 ..
SELECT 
SUM( goods_amount ) AS money, 
count( * ) AS num,
count(if(pay_status=1,true,null)) AS success, 
count(if(pay_status=2,true,null)) AS fall 
FROM `tab_order_info`   
WHERE user_id = 11