vba query to find record based on two criteria

Posted on 2011-09-02
Medium Priority
Last Modified: 2012-05-12
My form will prompt the user for Part Number.
In the table the records look like this:
PartNumber     CreateDate     LastSerialNumber
1                        1/1/2011            1
1                        1/1/2011            10
1                        1/1/2011            20

I need the vba code to return the record with the '20'.  In this table there are many different part numbers, dates, and serial numbers.  I need the record with the last serial number used for that part number and most recent date.  

Question by:gbnorton
LVL 14

Expert Comment

ID: 36475971

Does the CreateDate field include a time component? In your example, the three records have exactly the same date -- there is no way to distinguish the LastSerial Number by "most recent". Even if the table looks sorted by order of entry or ascending LastSerialNumber, it really isn't stored that way.

If there are ties, what LastSerialNumber would you want to return -- highest?


Author Comment

ID: 36476009
There is no time component.  But I could add it.  I need the highest serial number.
LVL 14

Accepted Solution

pteranodon72 earned 668 total points
ID: 36476111
OK -- just so you know in case of ties. Your data may not have ties, but defining a rule helps.

This assumes that LastSerialNumber and PartNumber are both defined as numeric, not text. Write back if either are text.

Dim lngLastSerialNumber as Long
lngLastSerialNumber = DMax("LastSerialNumber", "YourTable", "Partnumber = " & lngPartNumber & " AND CreateDate=(SELECT Max(CreateDate) FROM YourTable WHERE PartNumber = " & lngPartNumber & ")")

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LVL 47

Assisted Solution

aikimark earned 668 total points
ID: 36476941

If you need the greatest LastSerialNumber, then I don't see any reason to consider the date.

Public Function LastSerialNumberForPart(parmPartNum) As Long
   LastSerialNumberForPart = DMax("LastSerialNumber", "MyPartsTable", "Partnumber = " & parmPartNum)
End Function

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You can also use the DMax() domain function in a SQL statement.

Select *, 
DMax("LastSerialNumber", "MyPartsTable", "Partnumber = " & SomeTableThatHasAPartNumberColumn.PartNumber) As LastPartNo
From SomeTableThatHasAPartNumberColumn

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You can also do this in SQL
Select PartNumber, Max(CreateDate) As MaxPartDate, 
Max(LastSerialNumber) As PartLastSerNum 
From MyPartsTable
Group By PartNumber

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LVL 41

Assisted Solution

als315 earned 664 total points
ID: 36478081
If you want to find record on current form, old function from MS site can be helpful(modified to current Access vesions):
Function FindRecord_RS(SQLWhere)
Dim DS As Recordset
Set DS = Screen.ActiveForm.Recordset.Clone
DS.FindFirst SQLWhere
If DS.NoMatch Then
       MsgBox "No record found!"
       FindRecord_RS = False
       Screen.ActiveForm.Bookmark = DS.Bookmark
       FindRecord_RS = True
End If
End Function

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Examples of use you can find in original article:
Combine your PartNumber and dmax result.

Author Closing Comment

ID: 36502443
Thanks for all your suggestions.

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