Sql server 将日期与日期时间戳分开，然后按日期总计显示

我对SQL非常陌生，更确切地说，我已经8年左右没有使用过它了。这是在使用SQL Server的餐厅销售点系统中完成的。无论如何，这是我目前的代码：

select cashier_id,grand_total, num_people_party, datetime
from invoice_totals
where datetime >= '2012-06-01'

最后，我想显示一个报告，列出每个日期的总服务人数（

num\u-people\u-served

）和总服务人数（

grand\u-total

），按出纳id（

cashier\u-id

）列出

因此：

这应该不会太难，但我只是不记得了，我的搜索也没有被证明有用。此外，还应注意，

DateTime

字段需要拆分，以便按日期对总计进行分组

---

从下面的注释中添加dividon字段时，添加后会出现以下错误：

Message: Could not retrieve datatable.
SELECT CASHIER_ID AS SERVER, CONVERT(VARCHAR(10),[DATETIME],111) AS DATE, SUM(GRAND_TOTAL) AS TOTAL_SALES, SUM(NUM_PEOPLE_PARTY) AS NUMBER_SERVED, SUM(GRAND_TOTAL) / SUM(NUM_PEOPLE_PARTY) AS CASHPERCUSTOMER
FROM INVOICE_TOTALS
WHERE [DATETIME] >= '2012-06-01'
GROUP BY CASHIER_ID, CONVERT(VARCHAR(10),[DATETIME],111) 
Stack Trace:    at PCA_DataMod.PCA_DB.OpenDT(String SQLLoadInfo, Boolean NoSchema)
   at PCA_DataMod.PCA_DB.OpenDT(String SQLLoadInfo)
   at pcAmerica.Desktop.POS.Forms.frmReportCustomWiz.GetRawSQLFields()
   at pcAmerica.Desktop.POS.Forms.frmReportCustomWiz.Display_Step(WizardStep Index)

Message: Divide by zero error encountered.
Stack Trace:    at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   at System.Data.SqlClient.SqlDataReader.HasMoreRows()
   at System.Data.SqlClient.SqlDataReader.ReadInternal(Boolean setTimeout)
   at System.Data.SqlClient.SqlDataReader.Read()
   at System.Data.Common.DataAdapter.FillLoadDataRow(SchemaMapping mapping)
   at System.Data.Common.DataAdapter.FillFromReader(DataSet dataset, DataTable datatable, String srcTable, DataReaderContainer dataReader, Int32 startRecord, Int32 maxRecords, DataColumn parentChapterColumn, Object parentChapterValue)
   at System.Data.Common.DataAdapter.Fill(DataSet dataSet, String srcTable, IDataReader dataReader, Int32 startRecord, Int32 maxRecords)
   at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)
   at PCA_DataMod.PCA_DB.OpenDT(String SQLLoadInfo, Boolean NoSchema)

---

有什么想法吗？

你可以按出纳和日期分组：

select     cashier_id
,          dateadd(d, 0, datediff(d, 0, [datetime]))
,          sum(grand_total)
,          sum(num_people_party)
from       invoice_totals
where      [datetime] >= '2012-06-01'
group by
           cashier_id
,          dateadd(d, 0, datediff(d, 0, [datetime]))

在SQL Server 2008及更高版本中，可以替换

dateadd(d, 0, datediff(d, 0, [datetime]))

与

---

您可以按日期部分进行分组：

select cashier_id,SUM(grand_total), SUM(num_people_party), DATEPART(dd,[datetime]) AS Day, DATEPART(mm,[datetime]) AS Month, DATEPART(yyyy,[datetime]) AS Year
from invoice_totals
where datetime >= '2012-06-01'
group by cashier_id, DATEPART(dd,[datetime]), DATEPART(mm,[datetime]), DATEPART(yyyy,[datetime])

或者更简单地说

select cashier_id, SUM(grand_total), SUM(num_people_party), DAY([datetime]) AS Day, MONTH([datetime]) AS Month, YEAR([datetime]) AS Year
from invoice_totals
where datetime >= '2012-06-01'
group by cashier_id, DAY([datetime]), MONTH([datetime]), YEAR([datetime])

---

可能的重复似乎效果很好，有几个后续问题：-如何更改报告中列的名称，它当前显示为出纳ID，第1列，第2列，第3列-有没有办法从显示中省略时间，它当前显示日期，然后是每条记录的12:00:00 AM时间-如何再添加一列，将总计除以每条记录的服务人数？1，在末尾添加

作为别名

，如

sum（grand_total）作为总计

。2.将

dateadd（d，0，datediff（d，0，[datetime]））

替换为

convert（varchar（10），[datetime]，111）

3

sum（总计）/sum（人数/人数/聚会）作为CashPerCustomer

3个中的2个工作得很好！然而，分割线似乎抛出了一个错误。我更新了原始问题以显示抛出的错误消息。我真的很感谢你的帮助！有一个被零除的错误，我添加了一个case语句来处理它。再次感谢您的帮助，感谢您抽出时间！

select cashier_id,SUM(grand_total), SUM(num_people_party), DATEPART(dd,[datetime]) AS Day, DATEPART(mm,[datetime]) AS Month, DATEPART(yyyy,[datetime]) AS Year
from invoice_totals
where datetime >= '2012-06-01'
group by cashier_id, DATEPART(dd,[datetime]), DATEPART(mm,[datetime]), DATEPART(yyyy,[datetime])

select cashier_id, SUM(grand_total), SUM(num_people_party), DAY([datetime]) AS Day, MONTH([datetime]) AS Month, YEAR([datetime]) AS Year
from invoice_totals
where datetime >= '2012-06-01'
group by cashier_id, DAY([datetime]), MONTH([datetime]), YEAR([datetime])