Sql 错误：将表达式转换为数据类型int时出现算术溢出错误

下面的查询返回下面的错误

Msg 8115，16级，状态2，第1行算术溢出错误 正在将表达式转换为数据类型int。警告：空值为 通过聚合或其他集合操作消除

Sql

SELECT
  Brands.BrandName AS [Brand],
  Outlets.OutletName AS [Outlet],
  AVG(DATEDIFF(ms, Orders.OrderDate, ReceivedOrders.ReceivingDate)) / 60000 AS [Receive],
  AVG(DATEDIFF(ms, ReceivedOrders.ReceivingDate, ReadyOrders.ReadyDate)) / 60000 AS [Ready],
  AVG(DATEDIFF(ms, ReadyOrders.ReadyDate, DispatchedOrders.DispatchedDate)) / 60000 AS [Dispatch],
  AVG(DATEDIFF(ms, DispatchedOrders.DispatchedDate, ClosedOrders.ClosingDate)) / 60000 AS [Close]
FROM dbo.Orders
INNER JOIN dbo.Outlets
  ON dbo.Orders.OutletID = dbo.Outlets.OutletID
INNER JOIN dbo.Brands
  ON dbo.Brands.BrandID = dbo.Outlets.BrandID
INNER JOIN dbo.ReceivedOrders
  ON dbo.Orders.OrderID = dbo.ReceivedOrders.OrderID
LEFT JOIN dbo.ReadyOrders
  ON dbo.Orders.OrderID = dbo.ReadyOrders.OrderID
LEFT JOIN dbo.DispatchedOrders
  ON dbo.Orders.OrderID = dbo.DispatchedOrders.OrderID
LEFT JOIN dbo.ClosedOrders
  ON dbo.Orders.OrderID = dbo.ClosedOrders.OrderID
WHERE Orders.OrderDate BETWEEN '2017-04-1' AND '2017-05-10'
AND ((dbo.Brands.BrandName IS NULL
OR dbo.Brands.BrandName LIKE '%' + '' + '%')
AND (dbo.Outlets.OutletName IS NULL
OR dbo.Outlets.OutletName LIKE '%' + '' + '%'))
GROUP BY Brands.BrandName,
         dbo.Outlets.OutletName
ORDER BY dbo.Outlets.OutletName, Brands.BrandName

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两个日期之间有很多毫秒的时间间隔——然后进行除法——这意味着SQL需要进行转换——显然，随着日期的增加，它会溢出它试图转换的整数类型

所以，你得到的是两个日期之间的毫秒差，然后除以60000得到分钟。为什么不在几分钟内开始呢？通过这种方式，这种溢出的可能性要低得多

而不是：

AVG(DATEDIFF(ms, Orders.OrderDate, ReceivedOrders.ReceivingDate)) / 60000 AS [Receive]

做：

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我认为毫秒的最大值大约是25天的差值：所以你可以改为秒并相应地除以

  AVG(DATEDIFF(s, Orders.OrderDate, ReceivedOrders.ReceivingDate)/60.0) AS [Receive],
  AVG(DATEDIFF(s, ReceivedOrders.ReceivingDate, ReadyOrders.ReadyDate)/60.0)  AS [Ready],
  AVG(DATEDIFF(s, ReadyOrders.ReadyDate, DispatchedOrders.DispatchedDate)/60.0)  AS [Dispatch],
  AVG(DATEDIFF(s, DispatchedOrders.DispatchedDate, ClosedOrders.ClosingDate)/60.0) AS [Close]

MSDN： 如果返回值超出int的范围（-2147483648到+2147483647），则返回错误。对于毫秒，startdate和enddate之间的最大差值为24天20小时31分钟23.647秒

  AVG(DATEDIFF(s, Orders.OrderDate, ReceivedOrders.ReceivingDate)/60.0) AS [Receive],
  AVG(DATEDIFF(s, ReceivedOrders.ReceivingDate, ReadyOrders.ReadyDate)/60.0)  AS [Ready],
  AVG(DATEDIFF(s, ReadyOrders.ReadyDate, DispatchedOrders.DispatchedDate)/60.0)  AS [Dispatch],
  AVG(DATEDIFF(s, DispatchedOrders.DispatchedDate, ClosedOrders.ClosingDate)/60.0) AS [Close]