Question

我在SQL server 2005 DB中有以下两个表 2-“UserInfomration”---＆gt; （ID（自动），姓名，性别（位））
1-“竞争对手”---＆gt; （Id（自动），UserID（来自UserInformation.ID的FK），状态（tinyint）
我想制作一个返回数据的存储过程，如下所示状态 - 男性人数 - 女性人数
1 45 15
2个10 50
3 20 60

所以任何人都可以与我分享最佳解决方案我的解决方案如下：

SELECT  
        Competitors.Status, 
        COUNT(Competitors.ID) AS MaleCount , 
        (
            SELECT Count(C.ID) 
            FROM Competitors as C , UserInfomration as UI
            WHERE UI.UserID = C.UserID  AND UI.UserGender = 0 AND C.Status = Competitors.Status  
        ) as FemaleCount ,
        (MaleCount + FemaleCount) as total
FROM     
        UserInfomration LEFT OUTER JOIN
               Competitors ON UserInfomration.UserID = ISEFCompetitors.UserID
GROUP BY Competitors.Status, UserInfomration.UserGender
HAVING  (UserInfomration.UserGender = 1)
ORDER BY Competitors.Status

提前感谢您的合作

Answer 1

您可以尝试这样的事情

SELECT  c.Status,
        SUM(CASE WHEN u.Gender = 0 THEN 1 ELSE 0 END) Male, --assuming 0 is male
        SUM(CASE WHEN u.Gender = 1 THEN 1 ELSE 0 END) Female --assuming 1 is female
FROm    Competitors c INNER JOIN
        UserInfomration u ON c.UserID = u.ID
GROUP BY c.Status

编写SQL以获取数据的最佳做法是什么？

1 个答案: