在1中优化许多SQL请求

Question

我有一个小问题，我有3个SQL请求，我想知道是否可以在1个请求中优化它们。

我的3 sql请求：

SELECT FAI, COUNT( FAI ) AS deferred_count
FROM  `email_errors` 
WHERE STATUS =1
GROUP BY FAI
-------------------------------------------
SELECT FAI, COUNT( FAI ) AS sent_count
FROM  `email_errors` 
WHERE STATUS =0
GROUP BY FAI
-------------------------------------------
SELECT FAI, COUNT( FAI ) AS Bounced_count
FROM  `email_errors` 
WHERE STATUS =2
GROUP BY FAI

所以，如果可能，我会尝试获得一个包含4列结果的输出表FAI|deferred_count|sent_count|bounced_count

我不知道是否可以根据请求通过“FAI”进行加入？

Answer 1

SELECT FAI, 
       sum( status = 0 ) AS send_count,
       sum( status = 1 ) AS deferred_count,
       sum( status = 2 ) AS Bounced_count
FROM  `email_errors` 
GROUP BY FAI