Question

我正在撰写通知提醒功能。我有一张表Notification，其中有一个字段Viewed。 Viewed的值为TINYINT。当用户查看通知时，它会翻转到1。然后基于Viewed我显示准备好警报的通知。现在，如果没有新的通知，我想显示最近查看的通知。我使用的查询是

$query="select * from notification where NotifierId=? and Viewed=0 order by
NotificationDate DESC ";

现在我想要做的是伪语言

Select Fields from notification where NotifierId=someid and Viewed=0 Incase 
there are new notifications but retreive the old as well Viewed=1 if the new
notifications are less than 10 ordered by date

如果有任何办法，请告诉我。感谢

Answer 1

我想你可能会对这样的事情感兴趣：

select
    *
from
    notification
where
    NotifierId=? and
    Viewed in (0, IF((select count(*) from notification where Viewed = 0)<10,1,0))
order by
    Viewed asc,
    NotificationDate desc

这将导致所有未查看的通知按日期降序排序，然后查看的通知将按日期降序显示。

我希望我能够完全理解你的问题，但如果没有，请告诉我。

为查看的通知组成mysql查询

1 个答案: