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原标题:SQL SELECT max value for each of another column

I have a problem trying to build a select query in SQL Server. Let s say I have a table called TicketInformation, which has an ID, a Date and a TicketID

--------------------------
|  ID | Date  | TicketID |
--------------------------
|  1  | 12/20 |    1     |
--------------------------
|  2  | 12/21 |    1     |
--------------------------
|  3  | 12/22 |    1     |
--------------------------
|  4  | 12/20 |    2     |
--------------------------
|  5  | 12/21 |    2     |
--------------------------
|  6  | 12/22 |    2     |

我想要做的是,选择只能归还每个电离层电离层电离层电离层电离层电离层电离层,例如,我需要3号和6号电离层,但我可以推测出如何做。

问题回答
SELECT TicketID, MAX(ID)
FROM TicketInformation
GROUP BY TicketID

日期:

SELECT ID, MAX(Date), TicketID FROM TicketInformation 
GROUP BY TicketID, Date 
ORDER BY Date;




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