How to use variable initiated in SQL query?

Question

I made a query to get Max value of a certain column

sSQLmax = "SELECT MAX([tablename]!rowname) as MaxNum FROM [tablename]"

I want to use MaxNum value. I tried it in a Msgbox and gave me a blank value. I tried all these:

MsgBox "MaxNum" & MaxNum

MsgBox "MaxNum" & sSQLMAX.MaxNum

MsgBox "MaxNum" & sSQLMAX!MaxNum

More of the code

Dim db As DAO.Database, rst As DAO.Recordset
Set db = CurrentDb
Set rst = db.OpenRecordset(sSQLmax)

but none works, Im sure its simple but it escapes me

Answer 1

With your code you are only setting a variable to a string. You are not actually doing anything with it. This is probably more of what you are looking for:

Dim db As DAO.Database, rst As DAO.Recordset, sSQLmax As String
sSQLmax = "SELECT MAX([tablename].rowname) as MaxNum FROM [tablename]"
Set db = CurrentDb

Set rst = db.OpenRecordset(sSQLmax, dbOpenDynaset)

If (rst.RecordCount <> 0) Then
  rst.MoveFirst
  MsgBox "MaxNumber: " & rst.Fields("rowname")
End If

Answer 2

Try the DMax function

Dim result as String
result = DMax("[COLUMN NAME]", "[TABLE NAME]")