Question

我有这个问题：

select 
    case when EventCategory < 0.05 Then 'NOT INCL' ELSE 'OK' END AS Under3Min
from
(
    Select   
    Sum(case when CustomEvent = 'without Stop' then cast(EventEndDateTime - EventStartDateTime as float)*24 else 0 end) as EventCategory
    FROM tDataCategory

在这个查询中，我从表CustomEvent中取出`without Stop'并取这个持续时间的总和。在第一个选择中，我说如果EventCategory小于0.05，那么它不应该包含其他包含。这给了我正确的输出。但我想在输出中排除“不包括”完整。如何排除此问题？

Answer 1

添加Where条件，

select 
    CustomEvent,
    case when EventCategory < 0.05 Then 'NOT INCL' ELSE 'OK' END AS Under3Min
from
(
    Select   
        CustomEvent,
        Sum(case when CustomEvent = 'without Stop' then cast(EventEndDateTime - EventStartDateTime as float)*24 else 0 end) as EventCategory
    FROM tDataCategory
    GROUP BY CustomEvent
) x
WHERE CustomEvent <> 'without Stop' 
    OR (CustomEvent = 'without Stop' AND x.EventCategory >=0.05)

Answer 2

   process (clk) is
   begin
        if rst='0' then   
            q < = "000000001";
        elsif rising_edge(clk) then 
            q <= d; 
        end if;
   end process;

从案例表达中排除

2 个答案: