獲取列和其他列值的最小值和最大值

Question

我有一個包含日期和時間列的表。我需要獲取最小日期和時間（col c）以及最大日期和時間（col D）以獲得唯一的ID。

E.g

 A B    C  D 
    1 12/10/2012  8.00  11.00 
    1 2/10/2013  10.00 12.00   
    2 1/10/2013  1.00  2.00 
    2 9/10/2012  6.00  7.00 

結果

 1 12/10/2012 8.00 2/10/2013 12.00 
    2 9/10/2012 6.00 1/10/2013 2.00 

Answer 1

WITH CTE AS 
(
SELECT A, MIN(B) as MinB, MAX(B) as MaxB 
FROM TableName 
GROUP BY A 
) 
SELECT C.A, C.MinB, tMin.C as MinC, C.MaxB, tMax.D as MaxD 
FROM CTE C 
LEFT JOIN TableName tMin on tMin.A = C.A AND tMin.B = c.MinB 
LEFT JOIN TableName tMax on tMax.A = C.A AND tMax.B = c.MaxB