Question

我对SQL很新。我构建了一个查询，以便每行指定一个事件的发生。这是一个示例（它存储在查询中的临时表中）。

Id  Date        Acct    FirstName   LastName
--------------------------------------------
123 2016-02-02  456789  Joan        Smith
123 2016-02-03  456789  Joan        Smith
456 2016-02-02  987654  John        Adams
789 2016-02-04  123789  Matt        James
789 2016-02-07  123789  Matt        James

我想要做的是拿下该表并计算每个人发生事件的总次数，但也能够查看事件发生的日期。

所以决赛桌应该是这样的：

ID  Acct    FirstName   LastName    2/1/2016    2/2/2016    2/3/2016    2/4/2016    2/5/2016    2/6/2016    2/7/2016    Total
123 456789  Joan        Smith                          1           1                                                        2
456 987654  John        Adams                          1                                                                    1
789 123789  Matt        James                                                  1                                   1        2

我能够获得总出现次数，但我不知道如何将日期作为新列。 CASE会有效吗？还是PIVOT？我不确定如何使用这两个命令来实现这一目标。

这是我到目前为止构建的查询和输出

select 
    ID,
    Acct,
    FirstName,
    LastName,
    Count(Date) as Total
from 
    ##tempTable
group by 
    Acct, PlayerID, FirstName, LastName

输出：

ID  Acct    FirstName   LastName    Total
-----------------------------------------
123 456789  Joan        Smith       2
456 987654  John        Adams       1
789 123789  Matt        James       2

Answer 1

如果你只关心那些日子，那么下面应该有效

select ID,
Acct,
FirstName,
LastName,
SUM(CASE WHEN [DATE] = '2016-02-01' THEN 1 ELSE NULL END) AS '2/1/2016',
SUM(CASE WHEN [DATE] = '2016-02-02' THEN 1 ELSE NULL END) AS '2/2/2016',
SUM(CASE WHEN [DATE] = '2016-02-03' THEN 1 ELSE NULL END) AS '2/3/2016',
SUM(CASE WHEN [DATE] = '2016-02-04' THEN 1 ELSE NULL END) AS '2/4/2016',
SUM(CASE WHEN [DATE] = '2016-02-05' THEN 1 ELSE NULL END) AS '2/5/2016',
SUM(CASE WHEN [DATE] = '2016-02-06' THEN 1 ELSE NULL END) AS '2/6/2016',
SUM(CASE WHEN [DATE] = '2016-02-07' THEN 1 ELSE NULL END) AS '2/7/2016',
Count(Date) as Total
from ##tempTable
group by Acct, ID, FirstName, LastName

使用字段中的日期在SQL Server中创建新列

1 个答案: