Question

I have a table as below:

ID    Title    StartDate    EndDate
1     PromoA   2012-06-01   2012-08-01
2     PromoB   2011-01-01   2011-02-01
3     PromoC   2012-09-01   2012-10-01
4     PromoD   2012-07-01   2012-09-01

So, there are 4 promotion with status: 1-OnGoing; 2-OutOfDate; 3-Waiting; 4-OnGoing

How to sort them by their status?

Answer 1

You can use the CASE statement to classify each row, as in the following (note that this assumes that StartDate <= EndDate for all rows:

;WITH cte AS
(
    SELECT ID, Title, StartDate, EndDate, 
        CASE WHEN (EndDate < CURRENT_TIMESTAMP) THEN 'OutOfDate' 
             WHEN (StartDate > CURRENT_TIMESTAMP) THEN 'Waiting' 
             ELSE 'Ongoing'
        END AS [Status]
    FROM Promotion
)
SELECT ID, Title, StartDate, EndDate
FROM cte
ORDER BY [Status]