Sql server SQL Server 2012中的OVER子句

我有以下数据：

Empid   Designation         
------------------------------------
17791   Assistant Manager   
19624   Assistant Manager   
19624   Assistant Manager   
19748   Assistant Manager   
19758   Graduate Engineer Trainee   

我希望输出如下所示：

Designation             Count
------------------------------
Assistant Manager         4
Graduate Engineer Trainee 1

请建议我们如何在没有子查询的情况下获得它

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谢谢

这似乎是一个非常简单的分组操作-如何：

SELECT
    Designation, COUNT(*)
FROM
    dbo.YourTableNameHere
GROUP BY
    Designation

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请显示您的尝试并解释什么不起作用我已经尝试了下面的选择指定，summycountmycount from select EMPID，designation，count designation overpartition BY EMPID ORDER BY EMPIDmycount from mytable x group BY designation，但我不想使用子查询