Mysql记录跟进

Question

大家好，我有一张桌子

“评论”如下

commentid      cmt                followupid    category 

1            hello                   3           starting 
2            hi how are you          4           starting
3            Hello Jhon              5           followup
4            Hi I am fine and you    6           followup

我希望回复记录，以便当我回显Hello时，将显示的下一个评论为Hello John，当我回显Hi how are you时，将显示的下一个评论为{{1} }}。 我试过

Hi  I am fine and you

但它不起作用。

Answer 1

指定的查询将获得followupid等于commentid的结果，并且您的示例中没有任何结果。

要使它工作，您需要明确指定您正在寻找的纪念品：

SELECT * FROM comment where category = 'followup' AND followupid = 3

如果是PHP，你可以从你正在打印的当前记录中得到这个：

echo $row['cmt'];

mysql_query("SELECT * FROM comment where category='followup' and followupid={$row['followupid']}");

Answer 2

尝试使用SELF JOIN

SELECT cb2.comment AS message, cb1.comment AS response
FROM  `chat_box` cb1
INNER JOIN chat_box cb2 ON cb2.followup_id = cb1.comment_id
LIMIT 0 , 30

将返回

Message |   Response  
Hello   |Hello John  
Hi, how are you Hi, | i am fine and you