Question

如何在SQL Server 2008中汇总子查询数据？

在此查询中，我想在此Score函数中对此CASE列数据求和，其中数字范围之间的点，足够的时间我尝试对此列求和它显示错误。

现在，我想将此列Score与Group by Applicant id相加，我可以将Score列数据加在一起的方式是什么？

但是我不能这样做。请帮助我，这里我是初学者。

SELECT   
    ApplicantId, point,
    'Score' =  CASE 
                 WHEN  point BETWEEN 4.00 AND 4.50 THEN ('3' )
                 WHEN  point BETWEEN 3.5 AND 4.00 THEN ('2' ) 
              END
FROM tblAcademicInfo
WHERE tblAcademicInfo.ApplicantId = tblAcademicInfo.ApplicantId

输出：

ApplicantId  point   Score
--------------------------------
   xzc1  3.25    NULL
   xzc1  4.36    3
   xzc1  3.59    2
   xzc1  4.00    3

Answer 1

有几个问题

您的WHERE条款毫无意义
要求每位申请人使用SUM()和GROUP BY条款
为了能够对值求和，您应该返回CASE中的数值而不是字符串文字
在您的查询中，您的选择中包含point列。但它不属于GROUP BY，因为您希望按applicantid进行分组。因此，您应该在此列上应用聚合函数（例如SUM()）或从结果集中删除它。

尝试

SELECT ApplicantId,
       SUM(CASE WHEN  point BETWEEN 4.0 AND 4.5 THEN 3
                WHEN  point BETWEEN 3.5 AND 4.0 THEN 2 
       END) Score
  FROM tblAcademicInfo
 GROUP BY ApplicantId

输出：

| APPLICANTID | SCORE |
|-------------|-------|
|        xzc1 |     8 |

这是 SQLFiddle 演示

Answer 2

您是否尝试过以下操作：

SELECT   ApplicantId,point,
    SUM(CASE 
WHEN  point BETWEEN 4.00 AND 4.50 THEN 3
WHEN  point BETWEEN 3.5 AND 4.00 THEN 2 
END
) [Score]
FROM tblAcademicInfo
WHERE tblAcademicInfo.ApplicantId
GROUP BY ApplicantId, point

Answer 3

试试这个

SELECT ApplicationId,Point,sum(Case When score IS Null Then 0 else score END) as SumScore
FROM tblAcademicInfo
GroupBy Applicatio0nId,Point,score

如何在SQL Server 2008中汇总子查询数据？

3 个答案: