SQL 到 GROUP BY 计算日期

Question

在通过 SQL 按日期对数据进行分组时，我需要一些帮助，但似乎遇到了错误。

这是我当前的 SQL 语句，用作传递给 Excel VBA 宏的变量。

SQLtext = "SELECT [Offered], [MidnightStartDate], tblConfig_Queue.[Name], tblConfig_Queue.[Reporting]" & _
"FROM tblData_QueuePerformanceByPeriod INNER JOIN tblConfig_Queue on tblConfig_Queue.Pkey = tblData_QueuePerformanceByPeriod.FKQueue " & _
"Where [Offered]>0 AND[MidnightStartDate]>" & MakeUSSQLDate(Sheet13.Range("A1").Value) & " AND [MidnightStartDate]<" & MakeUSSQLDate(Sheet13.Range("A2").Value + 1) & _
""

字段 MidnightStartDate 是美国格式的日期和时间字段。 MakeUSSQLDate 过程将其转换为英国格式。然后，我想从该字段中删除任何时间值，并且只有日期，并按此字段分组，以便为​​每个日期的每个 [Name] 和 [Reporting] 值提供 [Offered] 总数。我已经使用 convert 函数去除了时间，目前它的工作原理如下。

SQLtext = "SELECT [Offered], convert(varchar, [MidnightStartDate], 103) AS [Date2], tblConfig_Queue.[Name], tblConfig_Queue.[Reporting]" & _
"FROM tblData_QueuePerformanceByPeriod INNER JOIN tblConfig_Queue on tblConfig_Queue.Pkey = tblData_QueuePerformanceByPeriod.FKQueue " & _
"Where [Offered]>0 AND[MidnightStartDate]>" & MakeUSSQLDate(Sheet13.Range("A1").Value) & " AND [MidnightStartDate]<" & MakeUSSQLDate(Sheet13.Range("A2").Value + 1) & _
""

但是我似乎无法按日期分组。我已将GROUP BY CONVERT(varchar, [MidnightStartDate], 103) ORDER BY CONVERT(varchar, [MidnightStartDate], 103) 添加到 SQL 语句的末尾以尝试解决此问题，但只会返回错误消息。

Answer 1

我正在等待您的错误，但是...

如果您使用 GROUP BY 如下：

convert(varchar, [MidnightStartDate], 103)

您在 SELECT 字段中有这些字段：

[Offered], convert(varchar, [MidnightStartDate], 103),
tblConfig_Queue.[Name], tblConfig_Queue.[Reporting]

这是逻辑错误，因为您必须在 group by 子句中添加所有字段。

当您在 SELECTE 字段列表中使用 GROUP BY 时，您只能：

• 常量
• 分组字段
• 聚合函数

所以你必须像下面这样扩展你的 GROUP BY 子句：

GROUP BY [Offered], convert(varchar, [MidnightStartDate], 103) AS [Date2],
tblConfig_Queue.[Name], tblConfig_Queue.[Reporting]

Answer 2

假设您的错误与不包括其他字段或将它们包装在聚合函数中有关：

SQLtext = "SELECT [Offered], convert(varchar, [MidnightStartDate], 103) AS [Date2], tblConfig_Queue.[Name], tblConfig_Queue.[Reporting]" & _
"FROM tblData_QueuePerformanceByPeriod INNER JOIN tblConfig_Queue ON tblConfig_Queue.Pkey = tblData_QueuePerformanceByPeriod.FKQueue " & _
"WHERE [Offered]>0 AND [MidnightStartDate]>" & MakeUSSQLDate(Sheet13.Range("A1").Value) & " AND [MidnightStartDate]<" & MakeUSSQLDate(Sheet13.Range("A2").Value + 1) & _
"GROUP BY convert(varchar, [MidnightStartDate], 103), [Offered], tblConfig_Queue.[Name], tblConfig_Queue.[Reporting]" & _
"ORDER BY convert(varchar, [MidnightStartDate], 103)" & _
""

用BETWEEN清理

SQLtext = "SELECT [Offered], convert(varchar, [MidnightStartDate], 103) AS [Date2], tblConfig_Queue.[Name], tblConfig_Queue.[Reporting]" & _
"FROM tblData_QueuePerformanceByPeriod INNER JOIN tblConfig_Queue ON tblConfig_Queue.Pkey = tblData_QueuePerformanceByPeriod.FKQueue " & _
"WHERE [Offered]>0 AND [MidnightStartDate] BETWEEN" & MakeUSSQLDate(Sheet13.Range("A1").Value) & " AND " & MakeUSSQLDate(Sheet13.Range("A2").Value + 1) & _
"GROUP BY convert(varchar, [MidnightStartDate], 103), [Offered], tblConfig_Queue.[Name], tblConfig_Queue.[Reporting]" & _
"ORDER BY convert(varchar, [MidnightStartDate], 103)" & _
""

Answer 3

感谢您的帮助 - 我的最终工作代码

SQLtext = "SELECT SUM([Offered]), CAST([MidnightStartDate] AS INT), tblConfig_Queue.[Name], tblConfig_Queue.[Reporting]" & _
"FROM tblData_QueuePerformanceByPeriod INNER JOIN tblConfig_Queue on tblConfig_Queue.Pkey = tblData_QueuePerformanceByPeriod.FKQueue " & _
"Where [Offered]>0 AND[MidnightStartDate]>" & MakeUSSQLDate(Sheet13.Range("A1").Value) & " AND [MidnightStartDate]<" & MakeUSSQLDate(Sheet13.Range("A2").Value + 1) & _
"GROUP BY CAST([MidnightStartDate] AS INT), tblConfig_Queue.[Name], tblConfig_Queue.[Reporting]" & _
"ORDER BY CAST([MidnightStartDate] AS INT), tblConfig_Queue.[Reporting];"