[英]Setting subscription dates in MySQL
I'm dealing with a website where people can subscribe to certain things for virtual money. 我正在处理一个人们可以为虚拟货币订购某些东西的网站。 I need to put the dates at which subscriptions end in the database.
我需要将订阅结束的日期放在数据库中。 My table has a field "expiration" for that, which is a DATE.
我的表有一个字段“到期”,这是一个日期。
When the user extends his subscription, I need to add 1 month to this date. 当用户延长订阅时,我需要在此日期添加1个月。 However, if the subscription has already expired, I want to set "expiration" to 1 month from now, not to 1 month from when the subscription expired.
但是,如果订阅已经过期,我想将“到期”设置为从现在开始的1个月,而不是从订阅到期后的1个月。
I've tried: 我试过了:
UPDATE shop_user_rights SET expiration = ADDDATE(MAX(expiration, CURDATE()), INTERVAL 1 MONTH);
and 和
UPDATE shop_user_rights SET expiration = FROM_UNIXTIME(
MIN(
UNIX_TIMESTAMP(expiration),
UNIX_TIMESTAMP(CURDATE())
)
),
expiration = ADDDATE(expiration, INTERVAL 1 MONTH);
But both give syntax errors. 但两者都给出了语法错误。 Is there a way to do this in 1 query, or do I have to use some SELECT queries beforehand?
有没有办法在1个查询中执行此操作,或者我是否必须事先使用一些SELECT查询?
MIN()
和MAX()
函数用于分组:您需要LEAST()
和GREATEST()
。
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