BetweenDate in Query

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I have a table called Customer with a sample Data

CODE FM_DT TO_DT

A 1-Oct-2010 30-Oct_2010

Before each insert of Record A, I want to check the FM_DT and TO_DT, and make sure new entered date is not the equal to existing date and does not belong existing date range.

eg: It's not possible to add 2-Oct-2010 to 5-Oct-2010 for record A but if user try to insert the query should return a value.
I write a query but it allows duplicating.

Any solution from you?
this is my query

C++

SELECT 1

FROM OM_MERCH_CUST

WHERE MC_CUST_CODE = :NEW.MC_CUST_CODE

AND ((OM_MERCH_CUST.MC_FM_DT BETWEEN :NEW.MC_FM_DT AND :NEW.MC_TO_DT)

OR OM_MERCH_CUST.MC_TO_DT BETWEEN :NEW.MC_FM_DT AND :NEW.MC_TO_DT );

Posted 27-Oct-10 22:00pm

anwarntde

Updated 27-Oct-10 22:40pm

Dalek Dave

v3

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Dalek Dave 28-Oct-10 4:40am

Edited for Grammar, Spelling, Syntax and Readability.

3 solutions

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qontary · Answer 1 · 2010-10-27T22:26:00

Solution 1

This code should be working for the the sample that you give.

SQL

SELECT 1
FROM OM_MERCH_CUST
WHERE MC_CUST_CODE = :NEW.MC_CUST_CODE
AND ((OM_MERCH_CUST.MC_FM_DT < :NEW.MC_FM_DT)
AND (OM_MERCH_CUST.MC_TO_DT > :NEW.MC_TO_DT));

Posted 27-Oct-10 22:26pm

qontary

Spyker55 · Answer 2 · 2010-10-27T22:27:00

Try to do this it will add allot more validation and will eliminate the chance of a user entering the same date range or a date in the already set range.

and ((OM_MERCH_CUST.MC_FM_DT NOT BETWEEN :NEW.MC_FM_DT AND :NEW.MC_TO_DT)
or  (OM_MERCH_CUST.MC_TO_DT NOT BETWEEN :NEW.MC_FM_DT AND :NEW.MC_TO_DT)
or OM_MERCH_CUST.MC_FM_DT <> :NEW.MC_FM_DT
or OM_MERCH_CUST.MC_TO_DT <> :NEW.MC_TO_DT);

blaknar · Answer 3 · 2011-01-17T08:13:00

XML

''' <summary>
   ''' Check a Date Range exist in a Table's 2 date columns
   ''' </summary>
   ''' <param name="ToTestFromDate">From Date value from User Form</param>
   ''' <param name="ToTestToDate">To Date value from User Form</param>
   ''' <param name="FromDateColumnName">From Date Column Name in Table</param>
   ''' <param name="ToDateColumnName">To Date Column Name in Table</param>
   ''' <param name="TableName">Table Name of where From,To Date Column Exists</param>
   ''' <param name="DateParamBraces">"#" for Access, "'" for SQL</param>
   ''' <param name="Condition">Give your Where condition here.  "" for no condition. ELSE - " and FieldName = Value"</param>
   ''' <returns>Boolean</returns>
   ''' <remarks></remarks>

Public Function DateRangeFallsBetween2FldsOfaTable(ByVal ToTestFromDate As DateTime, ByVal ToTestToDate As DateTime, _
ByVal FromDateColumnName As String, ByVal ToDateColumnName As String, ByVal TableName As String, _
ByVal DateParamBraces As String, Optional ByVal Condition As String = "") As Boolean

If Not Condition = String.Empty Then
Condition = " and " & Condition
End If

Dim Query As String
Dim dtTemp As New DataTable

Query = "SELECT " & FromDateColumnName & ", " & ToDateColumnName & ", count(*) as TotalRecords FROM " & TableName & " " & _
" where (((" & FromDateColumnName & " between " & DateParamBraces & ToTestFromDate & DateParamBraces & _
" and " & DateParamBraces & ToTestToDate & DateParamBraces & ") or (" & ToDateColumnName & " between " & DateParamBraces & ToTestFromDate & DateParamBraces & _
" and " & DateParamBraces & ToTestToDate & DateParamBraces & ")) or ((" & DateParamBraces & ToTestFromDate.ToString("dd/MMM/yyyy") & DateParamBraces & " between " & FromDateColumnName & " " & _
" and " & ToDateColumnName & " " & ") or (" & DateParamBraces & ToTestToDate.ToString("dd/MMM/yyyy") & DateParamBraces & " between " & FromDateColumnName & " " & _
" and " & ToDateColumnName & " " & ")))" & _
Condition & _
" Group by " & FromDateColumnName & ", " & ToDateColumnName & " " & _
" order by " & FromDateColumnName & ""

dtTemp = CType(FetchData(Query, 0, "tblStaffMaster"), DataSet).Tables(0).Copy

DateRangeFallsBetween2FldsOfaTable = If(dtTemp.Rows.Count > 0, True, False)

If DateRangeFallsBetween2FldsOfaTable Then
MsgBox("Date Range Already Exist FOR " & Condition)
End If

End Function

BetweenDate in Query

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