ETL datetime到整数错误代码

Question

我在Visual Studio 2017中编写了一个ETL，我收到了这个错误：

因此，我无法将datetime数据类型转换为整数数据类型。

但问题是，我的查询返回一个int而不是一个datetime数据类型。 查询：

>>> x = 1
>>> type(x)
<type 'int'>
>>> x = "sss"
>>> type(x)
<type 'str'>

这是我运行此查询时的结果： reservationDate，eventStartDate和eventEndDate在我的时间维度中引用一个键，作为int而不是datetime。

我尝试使用此查询创建一个视图，然后在我的ETL中使用它，但Visual Studio仍将列作为datetime数据类型处理。

有什么建议吗？

**编辑：所以要清楚，我的目标是让数据类型返回INT而不是日期数据类型。我需要INT来引用我的时间维度。

Answer 1

在内部使用CAST作为DATE尝试：

SELECT    e.eventName, e.eventType, e.numberOfPersons, 
          (SELECT CAST (timeKey AS DATE) FROM ArenAStar.dbo.timeDim WHERE 
          (r.reservationDate = [DATE])) AS reservationDate,
      (SELECT CAST (timeKey AS DATE) FROM ArenAStar.dbo.timeDim AS timeDim_2 
WHERE 
      (e.eventStartDate = [DATE])) AS eventStartDate,
      (SELECT timeKey FROM ArenAStar.dbo.timeDim AS timeDim_1 WHERE 
      (e.eventEndDate = [DATE])) AS eventEndDate,
      contact.name, customer.company, invoices.price, invoices.invoiceId
FROM  events AS e 
      INNER JOIN reservation AS r ON e.reservationId = r.reservationId 
      INNER JOIN customer ON e.customerId = customer.customerId 
      INNER JOIN contact ON customer.contactId = contact.contactId 
      INNER JOIN invoices ON e.invoiceId = invoices.invoiceId