Mysql 返回了多个子查询
选择email,expiration from member,其中expiration=选择ifnullemail,电话作为'Contact'从成员处发送,其中expiration>='2008'和expiration在此类情况下使用in代替=Mysql 返回了多个子查询,mysql,Mysql,选择email,expiration from member,其中expiration=选择ifnullemail,电话作为'Contact'从成员处发送,其中expiration>='2008'和expiration在此类情况下使用in代替= select email, expiration from member where expiration in (select ifnull(email, phone) as 'Contact' from member where expirati
select email, expiration
from member
where expiration in (select ifnull(email, phone) as 'Contact' from member where expiration >= '2008' and expiration <='2009');
但这也行不通。因为你试图将过期时间与电子邮件或电话进行比较
正确的查询应该类似于:
select ifnull(email, phone) as 'Contact', expiration
from member
where expiration >= '2008' and expiration <='2009';
为什么有子查询呢?选择ifnullemail和手机作为会员的“联系人”有什么问题,过期时间>='2008',过期时间工作正常,谢谢@kba,把它作为答案有什么不对?@Rahul我想我误解了这个问题。这似乎太明显了。我只是复制了他自己的子查询。@kba,现在看,你错过了+15次重复: