Sql server 将多个日期字段连接到日历表

我有一个表，我们称之为记录，其中相关数据按如下方式组织：

| Employee | SubmissionDate | FirstReviewDate | SecondReviewDate |
  Anne       2017-10-02       2017-10-03        2017-10-10          
  Bernard    2017-10-03       2017-10-05        2017-10-10
  Charlene   2017-10-06       2017-10-09        2017-10-09
  Danielle   2017-10-02       2017-10-03        2017-10-09
  Anne       2017-10-03       2017-10-03        2017-10-09

每次员工提交时，都会添加一个带有提交日期的新条目。随后对记录进行编辑，以包括第一次和第二次审查

我还有一个名为calendar的日历表，其中有一个名为Date的字段，其中包含今年每天的日期。我想做的是将SubmissionDate、FirstReviewDate和SecondReview date与Calendar.TheDate关联，以便我可以在任何给定的日期对所有三个字段进行计数

我尝试了以下代码：

SELECT Employee,
       Count(SubmissionDate) AS "Submissions",
       Count(FirstReviewDate) AS "First Reviews",
       Count(SecondReviewDate) AS "Second Reviews"
  FROM Records
  LEFT JOIN Calendar ON Records.SubmissionDate = Calendar.TheDate
   AND Records.FirstReviewDate = Calendar.TheDate
   AND Records.SecondReviewDate = Calendar.TheDate
 WHERE TheDate = '2017-10-11'

所有这些变化我都没有尝试过输出：

| Employee | Submissions | First Reviews | Second Reviews |

我想要的代码如下所示：

SELECT Employee,
       Count(SubmissionDate),
       Count(FirstReviewDate),
       Count(SecondReviewDate)
  FROM ???
 WHERE TheDate = '2017-10-03'

哪里？？？将是合适的连接。使用所需的代码块（包括where子句），所需的输出对于提供的示例数据如下所示：

| Employee | Submissions | First Reviews | Second Reviews |
  Anne       1             2               0
  Bernard    1             0               0
  Charlene   0             0               0
  Danielle   0             1               0

我不知道该如何加入。我已经阅读了很多关于日历表的参考资料，但是示例中总是包含连接表，每个表都有一个日期标识符。我的问题是，我有一个表，其中有三个日期字段需要与Calendar.TheDate关联

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我这样安排我的数据，以便数据可以在Qlik意义上可视化。我希望用户能够从过滤器面板中选择日期，并让它在指定日期（基本上与示例代码中的WHERE子句相同）聚合所有三个字段。

这应该可以工作-我为示例数据提供了一些简单的DML：-

--Table Setup
IF OBJECT_ID('Records') IS NOT NULL
  DROP TABLE Records;
IF OBJECT_ID('Calendar') IS NOT NULL
  DROP TABLE Calendar;

CREATE TABLE Records (
  Employee varchar(100),
  SubmissionDate datetime,
  FirstReviewDate datetime,
  SecondReviewDate datetime
)


CREATE TABLE Calendar (
  TheDate datetime
)

INSERT Records
  VALUES ('Anne', '2017-10-02', '2017-10-03', '2017-10-10'),
  ('Bernard', '2017-10-03', '2017-10-05', '2017-10-10'),
  ('Charlene', '2017-10-06', '2017-10-09', '2017-10-09'),
  ('Danielle', '2017-10-02', '2017-10-03', '2017-10-09'),
  ('Anne', '2017-10-03', '2017-10-03', '2017-10-09')


INSERT Calendar
  VALUES ('2017-10-03'), ('2017-10-04'), ('2017-10-05')



--Main Query
DECLARE @TheDate datetime = '2017-10-03'

SELECT
  Employee,
  SUM(CASE
    WHEN c1.TheDate IS NOT NULL THEN 1
    ELSE 0
  END),
  SUM(CASE
    WHEN c2.TheDate IS NOT NULL THEN 1
    ELSE 0
  END),
  SUM(CASE
    WHEN c3.TheDate IS NOT NULL THEN 1
    ELSE 0
  END)
FROM Records r
LEFT JOIN Calendar c1
  ON r.SubmissionDate = c1.TheDate
  AND c1.thedate = @TheDate
LEFT JOIN Calendar c2
  ON r.FirstReviewDate = c2.TheDate
  AND c2.thedate = @TheDate
LEFT JOIN Calendar c3
  ON r.SecondReviewDate = c3.TheDate
  AND c3.thedate = @TheDate
GROUP BY Employee

试试下面的代码

create table #recs (
  Employee varchar(10), 
  SubmissionDate date, 
  FirstReviewDate date, 
  SecondReviewDate date
)

insert into #recs values
('Anne',       '2017-10-02', '2017-10-03', '2017-10-10'),          
('Bernard',    '2017-10-03', '2017-10-05', '2017-10-10'),
('Charlene',   '2017-10-06', '2017-10-09', '2017-10-09'),
('Danielle',   '2017-10-02', '2017-10-03', '2017-10-09'),
('Anne',       '2017-10-03', '2017-10-03', '2017-10-09')

select Employee
    , sum(IIF(SubD.Date_Value = #recs.SubmissionDate, 1, 0)) AS Submissions 
    , sum(IIF(SubD.Date_Value = #recs.FirstReviewDate, 1, 0)) AS [First Reviews]
    , sum(IIF(SubD.Date_Value = #recs.SecondReviewDate, 1, 0)) AS [Second Reviews]
from #recs
    left join DimDate SubD on SubD.Date_Value = '2017-10-03' and
        (SubD.Date_Value = #recs.SubmissionDate
        or SubD.Date_Value = #recs.FirstReviewDate
        or SubD.Date_Value = #recs.SecondReviewDate)
group by Employee

如果您的SQL Server早于2012，请使用用例而不是IIF

select Employee
    , sum(case when SubD.Date_Value = #recs.SubmissionDate then 1 else 0 end) AS Submissions 
    , sum(case when SubD.Date_Value = #recs.FirstReviewDate then 1 else 0 end) AS [First Reviews]
    , sum(case when SubD.Date_Value = #recs.SecondReviewDate then 1 else 0 end) AS [Second Reviews]
from #recs
    left join DimDate SubD on SubD.Date_Value = '2017-10-03' and
        (SubD.Date_Value = #recs.SubmissionDate
        or SubD.Date_Value = #recs.FirstReviewDate
        or SubD.Date_Value = #recs.SecondReviewDate)
group by Employee

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如果你显示样本数据和结果会有所帮助。我的样本数据在顶部，我提到它没有输出任何内容。我将尝试编辑文章以使其更清晰。我需要查看所需的结果，而不是基于您尝试的结果。我已更新了我的原始文章，以包含更多示例数据以及所需的输出。我道歉；在我回应后，我意识到了你的要求。让我知道是否有其他我可以添加的澄清。根据所需的结果和原始数据。。你是怎么想到Anne有两个初审日期的？这段代码符合我的要求。非常感谢你的回复，我已经对回复投了赞成票（虽然还没有公开）；我已将你的回答标记为答案。