Question

我有一个查询，其中包含订阅了30天的简报试用版的电子邮件列表..

$thirty = time() - 3024000;

SELECT c.email 
  FROM tbl_clients AS c 
  JOIN tbl_clientoptions AS o ON o.client = c.id 
 WHERE o.option = 'newsletter' 
   AND c.datecreated > $thirty

我想要做的是检查同一个查询，这样如果客户端有tbl_clientoptions.option ='trialoverride'，它还会返回超过30天的客户端（即客户机选项表中的一行，其值为“ trialoverride“）

TBL_CLIENTS表：

ID
名称
电子邮件
dateCreated会

TBL_CLIENTOPTIONS表：

ID
客户端
选项

Answer 1

怎么样：

SELECT c.email 
   FROM tbl_clients AS c JOIN tbl_clientoptions AS o
   ON o.client = c.id 
   WHERE (o.option = 'newsletter' AND c.datecreated > $thirty) 
     || o.option = 'trialoverride';

Answer 2

通常只有一个OR条件会执行此操作，如果同一用户用户同时具有这两个条件，则添加DISTINCT，否则将其删除：

SELECT DISTINCT c.email 
FROM tbl_clients c 
 INNER JOIN tbl_clientoptions o ON (o.client = c.id) 
WHERE
 (o.option = 'newsletter' AND c.datecreated < $thirty) OR
 (o.option = 'trial override' AND c.datecreated > $thirty);

MYSQL - 查询以查看其他表（很难解释...）

2 个答案: