update t set empLogon = TT.newLogonfrom tblBooking tinnerjoin tblMembers TM on t.empLogon = TM.empLogoninnerjoin tblTemp TT on TT.empNum = TM.empNum
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3 table update query
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update t set empLogon = TT.newLogonfrom tblBooking tinnerjoin tblMembers TM on t.empLogon = TM.empLogoninnerjoin tblTemp TT on TT.empNum = TM.empNum