mysql - 有没有办法将单个字段值拆分为多列

Question

我有一种情况，我应该显示 columnar 时尚

我正在使用这个查询

SELECT status, count(*) as total_
FROM companydata 
WHERE status = 'Not Emailed' or status = 'Not Emailed' or status = 'Email Sent' or status = 'Response Received' or status = 'Interested' or status =
'Not Interested'
GROUP BY status

它返回这样的东西

   status               total_
-|--------------------|--------------------------
    Not Emailed         9562
 |   Interested       |   2
    Response Received     45
 |  Email Sent        |   3000

有没有办法让它们看起来柱状时尚

Not Emailed    Interested    Response Received   Email Sent

9562             2               45                   3000

Answer 1

将您的原始查询更改为有条件地计数

SELECT Count(CASE WHEN status = 'Not Emailed' THEN 1 END) AS `Not Emailed`,
       Count(CASE WHEN status = 'Email Sent' THEN 1 END) AS `Email Sent`,
       Count(CASE WHEN status = 'Response Received' THEN 1 END) AS `Response Received`,
       Count(CASE WHEN status = 'Not Interested' THEN 1 END) AS `Not Interested`
FROM   yourtable
WHERE  status IN ( 'Not Emailed', 'Not Emailed', 'Response Received', 'Interested', 'Not Interested' ) 

或者，我们也可以使用 SUM 聚合来代替 COUNT

Sum(CASE WHEN status = 'Not Emailed' THEN 1 ELSE 0 END) AS `Not Emailed`