Question

我有一张桌子，其结构如下：

VoteId  QuestionId  AnswerId    EmployeeId

6        1              5              2
7        1              1              1
10       2              6              1
12       1              1             24

这里为QuestionId 1，我们有2个答案。 AnswerId 1和5.对于答案1，两名员工已投票，EmployeeId 1和24.另外，对于AnswerId 5，EmployeeId 2已投票。

现在，从此表中我需要根据AnswerId计算单个QuestionId的每个EmployeeId的百分比。

我怎么解决这个问题？

Answer 1

这就是你所追求的：

DECLARE @t TABLE (VoteId  INT,QuestionId  INT,AnswerId    INT,EmployeeId INT)
INSERT @t VALUES 
(6,   1,    5,   2),
(7,   1,    1,    1),
(10,  2,    6,    1),
(12,  1,    1,   24)

SELECT  QuestionId, 
        COUNT(*) * 100.0 / (SELECT COUNT(*) FROM @t)
        AS PercentageOfVotesReceived
FROM    @t
GROUP   BY QuestionId

SELECT  AnswerId, 
        COUNT(*) * 100.0 / (SELECT COUNT(*) FROM @t)
        AS PercentageOfVotesReceived
FROM    @t
GROUP   BY AnswerId 

SELECT  EmployeeId, 
        COUNT(*) * 100.0 / (SELECT COUNT(*) FROM @t)
        AS PercentageOfVotesReceived
FROM    @t
GROUP   BY EmployeeId

找到百分比值

1 个答案: