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Delete based on Column, and date added

Posted on 2011-09-17
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Last Modified: 2012-05-12
The attached module works quickly, but, what I need is to put in one more criteria, where it deletes the oldest, and leaves the newest.

For example it would keep the one with the 9/30/2011 date

Contraint Number              Date

453                                   9/01/2011
453                                   9/30/2011
Option Compare Database

Function DeleteDuplicates()
    Dim DeleteCount As Double ' Make this a Long if you really have that many records
    Dim temp
    Dim sql As String
    Dim rst As Recordset

    
    '' Change DESC to ASC to keep the older record
    '' Leave DESC to keep the newer record
    sql = "SELECT [tbl_GMNA Constraint Report Output].* FROM [tbl_GMNA Constraint Report Output] ORDER BY [tbl_GMNA Constraint Report Output].[Constraint Number] DESC"

    Set rst = CurrentDb.OpenRecordset(sql, dbOpenDynaset)
    
    If rst.EOF Then
        MsgBox "There are no records in this table!"
        Exit Function
    End If
    'Stop
    rst.MoveFirst
    Do Until rst.EOF
        If temp = rst![Constraint Number] Then
            rst.Delete
            DeleteCount = DeleteCount + 1
        Else
            temp = rst![Constraint Number]
        End If
        rst.MoveNext
    Loop
    Set rst = Nothing
    MsgBox "Found and deleted " & CStr(DeleteCount) & " records."

 End Function

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Question by:mato01
  • 7
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11 Comments
 
LVL 16

Expert Comment

by:Sheils
ID: 36555449
Try this

 
Option Compare Database

Function DeleteDuplicates()
    Dim DeleteCount As Double ' Make this a Long if you really have that many records
    Dim temp
    Dim sql As String
	Dim sql2 as String
    Dim rst As Recordset
	Dim rst2 As Recordset
	Dim datMax as Date

    
    '' Change DESC to ASC to keep the older record
    '' Leave DESC to keep the newer record
    sql = "SELECT [tbl_GMNA Constraint Report Output].* FROM [tbl_GMNA Constraint Report Output] ORDER BY [tbl_GMNA Constraint Report Output].[Constraint Number] DESC"

    Set rst = CurrentDb.OpenRecordset(sql, dbOpenDynaset)
    
    If rst.EOF Then
        MsgBox "There are no records in this table!"
        Exit Function
    End If
    'Stop
    rst.MoveFirst
    Do Until rst.EOF
        If temp = rst![Constraint Number] Then
            
			sql2="SELECT [tbl_GMNA Constraint Report Output].* FROM [tbl_GMNA Constraint Report Output]" 
			sql2=sql2 & " WHERE [Constraint Number]=" & rst("Constraint Number") 
			sql2=sql2 & " ORDER BY [tbl_GMNA Constraint Report Output].[Constraint Number] DESC"
			
			rst2.open sql2
			
			datMax=rst2("fldDate")
			
			if rst2.Count>1 Then
			
			sql2="Delete * From [tbl_GMNA Constraint Report Output] WHERE [Constraint Number]=" & rst("Constraint Number")
			sql2=sql2 & " AND fldDate Is Not #" & datMax & "#"
			
			CurrentDB.Execute sql2
			
			End If
			
			rst2.close
			
            DeleteCount = DeleteCount + 1
        Else
            temp = rst![Constraint Number]
        End If
        rst.MoveNext
    Loop
    Set rst = Nothing
    MsgBox "Found and deleted " & CStr(DeleteCount) & " records."

 End Function

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Author Comment

by:mato01
ID: 36555488
It gave an error "Compile Error: Method or data member not found"

at below line

rst2.Open sql2
0
 
LVL 16

Expert Comment

by:Sheils
ID: 36555542
change fldDate to the name of the field that holds the date in your db and also change rst2.Count to rst2.RecordCount
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Author Comment

by:mato01
ID: 36556337
Make above suggested changes, and still "Compile Error: Method or data member not found" at
rst2.Open sql2. Did not work.  Also, tried to change rst2.Open sql2 to rst2.OpenRecordset sql2.
***********************************************************************************************************************
            rst2.Open sql2

            datMax = rst2("Date Added")
           
            If rst2.RecordCount > 1 Then
0
 
LVL 16

Expert Comment

by:Sheils
ID: 36556962
try:

sql2="SELECT [tbl_GMNA Constraint Report Output].* FROM [tbl_GMNA Constraint Report Output]"
                  sql2=sql2 & " WHERE [Constraint Number]=" & rst.fields("Constraint Number")
                  sql2=sql2 & " ORDER BY [tbl_GMNA Constraint Report Output].[Constraint Number] DESC"
                  
                  rst2.open sql2
                  
                  datMax=rst2.fields("fldDate")

My apology for the syntax errors.

If you still have problem do a debug.print and post the output. That is

sql2="SELECT [tbl_GMNA Constraint Report Output].* FROM [tbl_GMNA Constraint Report Output]"
sql2=sql2 & " WHERE [Constraint Number]=" & rst.fields("Constraint Number")
sql2=sql2 & " ORDER BY [tbl_GMNA Constraint Report Output].[Constraint Number] DESC"

Debug.print sql2

The output will be in the immediate window. Copy and post                  
                  
0
 

Author Comment

by:mato01
ID: 36557541
That didn't work.  This is new for me.  How do I debug.print?
0
 

Author Comment

by:mato01
ID: 36557918
I've attached a sample of the database for reference.

The error message is

COMPILE ERROR: Method or Data Member Not Found highlights this line.

  rst2.Open sql2

test11.accdb
0
 
LVL 16

Accepted Solution

by:
Sheils earned 500 total points
ID: 36559079
This works

 
Function DeleteDuplicates()
    Dim DeleteCount As Long ' Make this a Long if you really have that many records
    Dim temp
    Dim sql As String
    Dim sql2 As String
    Dim rst As DAO.Recordset
    Dim rst2 As DAO.Recordset
    Dim datMax As Date

    
    '' Change DESC to ASC to keep the older record
    '' Leave DESC to keep the newer record
    sql = "SELECT [tbl_GMNA Constraint Report Output].* FROM [tbl_GMNA Constraint Report Output] ORDER BY [tbl_GMNA Constraint Report Output].[Constraint Number] DESC"

    Set rst = CurrentDb.OpenRecordset(sql, dbOpenDynaset)

    If rst.EOF Then
        MsgBox "There are no records in this table!"
        Exit Function
    End If
        
    rst.MoveFirst
    Do Until rst.EOF
  
        If temp = rst![Constraint Number] Then
        
        
        sql2 = "SELECT [tbl_GMNA Constraint Report Output].* FROM [tbl_GMNA Constraint Report Output]"
                  sql2 = sql2 & " WHERE [Constraint Number]='" & rst.Fields("Constraint Number")
                  sql2 = sql2 & "' ORDER BY [tbl_GMNA Constraint Report Output].[Constraint Number] DESC"
                  
                  
                  Set rst2 = CurrentDb.OpenRecordset(sql2, dbOpenDynaset)
                  
                  datMax = rst2.Fields("Date Added")

            
            If rst2.RecordCount > 1 Then
            
            sql2 = "Delete * From [tbl_GMNA Constraint Report Output] WHERE [Constraint Number]=" & rst("Constraint Number")
            sql2 = sql2 & " AND [Date Added] Is Not #" & datMax & "#"
            
            CurrentDb.Execute sql2
            
            End If
            
            rst2.Close
            
            DeleteCount = DeleteCount + 1
        Else
            temp = rst![Constraint Number]
        End If
        rst.MoveNext
    Loop
    Set rst = Nothing
    MsgBox "Found and deleted " & CStr(DeleteCount) & " records."

End Function

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Author Comment

by:mato01
ID: 36567469
When I ran it, I received the following error.

Run-time error '3075.:

Invalid use of IS operator in query expression '[Constraint Number] = 766 AND [Date Added] Is not #9/11/2011'.
0
 

Author Comment

by:mato01
ID: 36567528
Changed

sql2 = sql2 & " AND [Date Added] Is Not #" & datMax & "#"

to

sql2 = sql2 & " AND [Date Added] <> #" & datMax & "#"

and received a  Run-time error '3464'

Data type mismatch in criteria expression
0
 

Author Closing Comment

by:mato01
ID: 36568899
I was able to get an answer.  But, wanted to award you ALL the points for all your great help.  Thanks
0

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