update Query - UPDATE BNPARB_EOD_Sum LEFT JOIN Trades ON (sgn(BNPARB_EOD_Sum.Position)=sgn(Trades.TradePosition))
AND (BNPARB_EOD_Sum.ChildAccount=Trades.Account) AND (BNPARB_EOD_Sum.CTCLID=Trades.NNFComplianceId)
AND (Cdate(BNPARB_EOD_Sum.[Trade Date])=Cdate(Trades.TradeDate))
AND...