在if语句中使用where语句

Question

如果在where语句中，我试图让所有行的datetime大于NOW（），但如果type ='economy'，我想限制它只显示if datetime与NOW（）之间的日期大于14天。

喜欢的东西：

Select type,date(datetime) as date 
from tbl1 
where datetime > NOW() 
IF(type = 'economy') && datediff(datetime,NOW()) > 14 
order by datetime desc 

我试着情况下还可以，但不能看着办吧......

Answer 1

您可以将标准只分为2周不同的比较：

select type,date(datetime) as date 
from tbl1 
where (datetime > NOW() AND type <> 'economy') OR 
     (datediff(datetime, NOW()) > 14 AND type = 'economy') 
order by datetime desc 

（未检查的语法错误，但这个想法应该是正确的......）

Answer 2

WHERE ((type <> 'economy') AND (datetime > now)) OR ((type = 'economy') AND (datediff(datetime,NOW()) > 14) 

'

Answer 3

SELECT type, date(datetime) AS date 
FROM tbl1 
WHERE (type <> 'economy' AND datetime > NOW()) 
    OR (type = 'economy' AND datediff(datetime, NOW()) > 14)