如何獲得總數？

Question

我目前的查詢返回的總人數在各民族不如預期，例如：

Name  | Count 
---------------------- 
White  | 22 
Asian  | 15 
Black  | 12 

等等但是我想補充一個THRID列返回各族羣爲總數的百分比，我會怎麼做呢？

SELECT 
    eo.EthnicOriginName, 
    ISNULL(e.Number, '') 
    --CAST(e.Number AS FLOAT)/CAST(COUNT(e.intEthnicOriginID) AS FLOAT) * 100 

FROM 
    tblEthnicOrigin eo 
    INNER JOIN tblPerson p ON p.intEthnicOriginID = eo.EthnicOriginID 

    LEFT JOIN (SELECT intEthnicOriginID, COUNT(p.intPersonID) [Number] 
      FROM tblPerson p 
      INNER JOIN tblClient c on c.intPersonID = p.intPersonID 
      GROUP BY intEthnicOriginID) e on e.intEthnicOriginID = eo.EthnicOriginID 

GROUP BY 
    eo.EthnicOriginName, e.Number 

Answer 1

在大多數數據庫中，您將使用ANSI標準的窗函數：

的* 1.0很簡單，因爲有些數據庫做整數除法，而我們不想整數除法。