SQL更新触发到系统时间> 20分钟的列时间

Question

I am very new to SQL Triggers.

I have a column "Status_ID" where it gets updated by different values. My Trigger should flag a column "Alarm_Late_Pickup" whenever the "Status_ID" is not updated to value "4" before 20 minutes of the current time, the next step is to flag another column "Late_Pickup" when the "Status_ID" is not set to "5" when the current time is Larger then the "Pickup_Time" column.

Answer 1

I would say that you need an event schedule rather than a trigger. But, in SQL Server, you can do what you want with a computed column or view:

ALTER TABLE 
    t
ADD 
    IsFinished AS (CASE 
                        WHEN 
                            (Pickup_Time < DATEADD(MINUTE, -20, GETDATE()) 
                            OR
                            (Delivery_Time < DATEADD(MINUTE, -20, GETDATE()))) THEN 1 
                        ELSE 0 END)

This adds a column to the table that is recalculated each time it is used.