比较SQL语句中的日期

Question

我尝试使用以下语句来检查订单是否延迟，但会导致语法错误。我怎么写呢？

select (enddate > targetdate ) as late from orders

Answer 1

您似乎正在搜索与case表达式类似的内容：

select 
    case 
        when enddate > targetdate then 1 
        else 0 
    end as late
from orders

Answer 2

我想你需要case

select 
    case 
        when enddate > targetdate then 'enddate  is greater' 
        else 'targetdate is greater' 
    end as late
from orders