How to use Docmd.RunSQL

I would like to update a field to an inputed value on a combo box using the Domcd.runsql function in VB.

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You'll need to be a bit more specific. If I got you correctly, you want to take a selected value (by the user) from a combo box and want to update (not insert) it to a table, via docmd.runsql? It'd be easier to help if you could tell us a little more about what it is you are doing.
Dim Mydb As Database
Dim strSQL As String

Set Mydb = CurrentDb

strSQL = "UPDATE tblRefuel SET odometer = " & Me!ComboBox & " WHERE VehID = " & Me!VehID
Mydb.Execute strSQL


DoCmd.RunSQL is used like this:

Dim strSQL As String

strSQL = "UPDATE TableName SET FieldName = " & Me.TextBox & " WHERE IDField = " & Me.ControlWithIDValue

DoCmd.RunSQL strSQL

The DoCmd.RunSQL can ONLY be used with action queries such as INSERT, UPDATE, DELETE, CREATE TABLE, DROP TABLE, TRUNCATE TABLE, etc.  You CANNOT use it to return a recordset (i.e. SELECT statement).

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currentdb.execute ("UPDATE TableName SET FieldName = " & Me.TextBox & " WHERE IDField = " & Me.ControlWithIDValue)

and you dont get any warnings


as everyone above

Just add

DoCmd.RunSQL strSQL
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