Determine if record exists when updating Access database using Excel VBA
Modify the insert statement to check for the existence of the key. Given what you explained, that would be
Sub Upload_Excel_to_Access() Dim wbpath As String wbpath = Application.ActiveWorkbook.Path Dim con As Object '' ADODB.Connection Set con = CreateObject("ADODB.Connection") '' New ADODB.Connection con.Open "Provider=Microsoft.ACE.OLEDB.12.0;Data source=\\at\HRS SD Performance Data\Capacity DB.accdb;" con.Execute _ "INSERT INTO AssigenedVol_tbl " & _ "SELECT SRC.* FROM [Excel 12.0 Xml;HDR=YES;IMEX=2;ACCDB=YES;DATABASE=C:\Users\luga\Desktop\Databasetest\DB Macro Test.xlsm].[rawdata$] " _ & " AS SRC " _ & "WHERE NOT EXISTS (select 1 from AssigenedVol_Tbl CHK WHERE CHK.ID_Unique = SRC.ID_Unique)" con.Close Set con = NothingEnd SubNote, the &'s - were done just to focus on the fact that your SRC table is being labelled, and you're checking it as CHK.