如何显示最新插入的记录？

Question

我想在gridview显示最新插入的记录。

示例数据库：

Id  Alerts   Alert_Date
--  ------   ----------
1   Alert1   5/11/2015 12:12:22 PM
2   Alert2   5/11/2015 12:12:22 PM
3   Alert1   5/12/2015 12:12:22 PM
4   Alert2   5/13/2015 12:12:22 PM
5   Alert2   5/14/2015 12:12:22 PM
6   Alert3   5/14/2015 12:12:22 PM

预期输出：

Alerts    Alert_Date
------    ----
Alert1    5/12/2015 12:12:22 PM
Alert2    5/14/2015 12:12:22 PM
Alert3    5/14/2015 12:12:22 PM

SQL：

SELECT DISTINCT Alerts,
(SELECT TOP (1) tbl_Notifications.Alert_Date AS Expr1) AS Expr1
FROM tbl_Notifications

我尝试了上面给出的东西，但它没有用。帮我找一个合适的解决方案。谢谢。

Answer 1

尝试将GROUP BY子句与MAX函数一起使用，如下所示

SELECT Alerts, MAX(Alert_Date)
FROM tbl_Notifications
GROUP BY Alerts

Answer 2

试试这个

SELECT TOP (1) Alert,Alert_Date AS Expr1 
FROM tbl_Notifications order by alert_date desc