Question

我正在使用VB.Net编写ASP.NET Web表单页面。我正在编写代码以在折线图上使用，但我似乎无法按周分组查询。这是我的疑问：

SELECT F42119LA.SDMCU || '-' || F42119LA.SDLNTY AS BranchCode,
       AVG(F42119la.SDIVD-F42119LA.SDDRQJ) AS Days,
       WEEK(SDTRDJ) AS Day 
FROM KAI400.KAIPRDDTA.EXCHBYDATE EXCHBYDATE,
     KAI400.KAIPRDDTA.F42119L14 F42119LA 
WHERE F42119LA.SDBCRC = EXCHBYDATE.CXCRCD
  AND EXCHBYDATE.EXCHDATE = F42119LA.SDTRDJ
  AND F42119LA.SDTRDJ>='118006'
  AND F42119LA.SDTRDJ<='118096'
  AND F42119LA.SDNXTR<>'999'
  AND SDIVD <> 0
  AND SDDRQJ <> 0
  AND F42119LA.SDAEXP <> 0
  AND EXCHBYDATE.CXCRDC='USD'
  AND F42119LA.SDLNTY IN ('S','W')
  AND (SDMCU LIKE '%100' OR SDMCU LIKE '%150') 
GROUP BY SDMCU,
         SDLNTY,
         SDIVD,
         F42119LA.SDMCU || '-' || F42119LA.SDLNTY,
         WEEK(SDTRDJ) 
ORDER BY SDIVD,
         SDMCU,
         SDLNTY

这是sql字符串运行的代码：

Public Shared Function GetMyDataTableString(SqlString As String, Optional IncDb As Integer = 0) As DataTable
    Dim MyConn As OleDbConnection = GetMyConn(IncDb)
    Dim DbCmd As New OleDbCommand(SqlString, MyConn)
    Dim ReturnDataTable As New DataTable
    Try
        If Not MyConn.State = ConnectionState.Open Then
            MyConn.Open()
        End If
        Dim Reader As OleDbDataReader = DbCmd.ExecuteReader(CommandBehavior.CloseConnection)
        Using Reader
            ReturnDataTable.Load(Reader)
        End Using

    Catch ex As Exception
        LogSqlErrors(SqlString, "GetMyDataTableString " & ex.Message.ToString(), IncDb)
        If HttpContext.Current.Session("SITEADMIN") = "True" Then
        HttpContext.Current.Response.Write("<b>OleFun.GetMyDataTableString, datatable failed</b>---<br />" & ex.ToString)
        End If
    Finally 'Happens regardless of failing or succeeding
        MyConn.Close()
    End Try
    Return ReturnDataTable
End Function

每当我使用WEEK（）时，它都会给我这个错误：

Value in date, time, or timestamp string not valid

ONDATE是格式为MM / DD / YYYY的日期字段。有没有人知道按周分组的另一种方式或者可能给我这个错误的原因是什么？提前感谢您的回复。

Answer 1

-- date part takes the part of the date as first paramater:
-- you have:
DATEPART(SDTRDJ, wk)

-- needs to be:
DATEPART(wk, SDTRDJ)

Answer 2

DATEPART()可能是SQL Server中的一个函数，但它不是Db2中的函数。您可以使用WEEK()或WEEK_ISO()这些是Db2函数。 https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.1.0/com.ibm.db2.luw.sql.ref.doc/doc/r0005481.html

如果您使用的是最新版本的Db2 LUW，也可以使用EXTRACT https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.1.0/com.ibm.db2.luw.sql.ref.doc/doc/r0053629.html

db2 "values extract(WEEK FROM  current date)"

1          
-----------
         14

1 record(s) selected.

顺便说一下，您不需要按F42119LA.SDMCU || '-' || F42119LA.SDLNTY的串联进行分组，您可以单独按这些列进行分组，并且只能在SELECT中进行连接。

DB2 SQL Query按周分组

2 个答案: