Question

我对SQL很新，更确切地说，我已经8年左右没用过了。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，我想显示一份报告，其中列出了每个日期的出纳员ID（num_people_served）所服务的总人数（grand_total）和总计（cashier_id）

所以：

Cashier ID 223
2012-06-01   10   200.00
2012-06-02   23   245.00

Cashier ID 224
2012-06-01   15   123.00
2012-06-02   24   254.00

etc...

这不应该太难，但我只是不记得，我的搜索没有证明有用。此外，应该注意的是，DateTime字段需要拆分才能按日期对总计进行分组。

在添加下面评论中的dividion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？

Answer 1

你可以group by收银员和当天：

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，您可以替换

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

带

cast([datetime] as date)

Answer 2

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])

或更简单

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])

从DateTime标记单独的日期，然后按日期总计显示

2 个答案: