Question

我试图通过一个mysql查询获取回复的数量并且没有来自消息的回复。
例如，我发送＆＃34;嘿嘿呀？＆＃34;对于20个人，我想知道我收到了多少回复以及有多少回复。我有一个表Thread和查找表Message。

线程表有列：

1.threadId (varchar)
2.messageGuid (varchar)
3.messageLookupId (int)
4.fromId (varchar)
5.toId (varchar)
6.replied (tinyint(1))
7.dateSent (timestamp)

消息表包含列：

1.id (int)
2.message (text)

线程和消息表可以通过Thread.messageLookupId = Message.id

加入

我想要一个包含列的结果表：

message | totalSent | replied | notReplied | repliedPercentage | notRepliedPercentage

我已经尝试过

查询

SELECT Message.message, count(Message.id) replied 
FROM Thread
JOIN Message
ON Thread.messageLookupId = Message.id
WHERE replied LIKE 1
Group by Message.id
ORDER BY replied DESC

回复= 0表示没有回复
replied = 1表示已回复

这只会返回回复的号码，但是我很难获得我想要的其他列：

totalSent | notReplied | repliedPercentage | notRepliedPercentage

repliedPercentage和notRepliedPercentage将返回已回复的百分比而不是已回复

有什么想法吗？

Answer 1

您可以使用回复的列值进行求和。

SELECT Message.id, sum( replied) as replied, 
      sum(replied=0) as notReplied, 
      sum(replied)/count(message.id)*100 repliedPercentage, 
      sum(replied=0)/count(message.id)*100 as notRepliedPercentage
FROM Thread
JOIN Message
ON Thread.messageLookupId = Message.id
Group by Message.id

Answer 2

试试这个。

SELECT Message.id,
       Count(1)                    totalSent,
       Count(CASE
               WHEN replied = 1 THEN 1
             END)                  AS replied,
       Count(CASE
               WHEN replied = 0 THEN 1
             END)                  AS notReplied,
       Count(CASE
               WHEN replied = 1 THEN 1
             END) / Count(1) * 100 repliedPercentage,
       Count(CASE
               WHEN replied = 0 THEN 1
             END) / Count(1) * 100 AS notRepliedPercentage
FROM   Thread
       JOIN Message
         ON Thread.messageLookupId = Message.id
GROUP  BY Message.id

MySql计数行

查询

2 个答案: