SQL:使用differents子句获取列表两次，其中

我尝试使用不同的子句两次获取同一表中的同一列：

我的问题是：

SELECT 
    * 
FROM
    (SELECT TOP 10 
         CONVERT(DATE, attemptdate) AS Date, 
         Max(currentcount) AS A 
     FROM   
         logintracking 
     INNER JOIN 
         maxuser ON logintracking.loginid = maxuser.loginid 
     INNER JOIN 
         site ON site.siteid = maxuser.defsite 
     WHERE  
         attemptdate BETWEEN @dateDebut AND @dateFin 
         AND logintracking.clientaddr IN ('10.118.254.21', '10.118.254.156') 
     GROUP BY 
         CONVERT(DATE, attemptdate) 
     ORDER BY 
         CONVERT(DATE, attemptdate) ASC
    ) AS T1, 
    (SELECT TOP 10 
         CONVERT(DATE, attemptdate) AS Date, 
         MAX(currentcount) AS B 
     FROM   
         logintracking 
     INNER JOIN 
         maxuser ON logintracking.loginid = maxuser.loginid 
     INNER JOIN 
         site ON site.siteid = maxuser.defsite 
     WHERE  
         attemptdate BETWEEN @dateDebut AND @dateFin 
         AND logintracking.clientaddr = '10.118.254.35' 
     GROUP BY 
         CONVERT(DATE, attemptdate) 
     ORDER BY 
         CONVERT(DATE, attemptdate) ASC) AS T2 

结果:

预期结果：

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我的目标是两次获得同一列“maxcurrentcount”，并应用不同的where子句，以便获得两个名为A和B的列，并且我还需要在第一列中显示日期，您能提供帮助吗？谢谢

因为A和B之间的唯一区别是logintracking.clientaddr，所以您可以将该条件放在MAX函数的CASE语句中：

SELECT CONVERT(DATE, attemptdate) AS Date, 
    MAX(CASE WHEN logintracking.clientaddr IN ( '10.118.254.21', '10.118.254.156' ) THEN currentcount END) AS A,
    MAX(CASE WHEN logintracking.clientaddr IN ( '10.118.254.35' ) THEN currentcount END) AS B
FROM logintracking 
    INNER JOIN maxuser 
        ON logintracking.loginid = maxuser.loginid 
    INNER JOIN site 
        ON site.siteid = maxuser.defsite 
WHERE attemptdate BETWEEN @dateDebut AND @dateFin
GROUP BY CONVERT(DATE, attemptdate) 
ORDER BY CONVERT(DATE, attemptdate) ASC

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MySQL或Microsoft SQL Server？Microsoft SQL Server是否希望此maxcurrentcount为A、maxcurrentcount为B或此maxcase当foo=bar时，则currentcount结束为A、maxcase当bar=foo时，则currentcount结束为B？听起来像是在寻找自联接-如果向下滚动一点，此链接有一个示例：我想要第二个选择，像maxcurrentcount这样的东西，当。。。当。。。