i'm so tired of thinking master tables for our system.. actually.. we're changing our system information systems.. first we proposed to our prof.. patient dental information system ... the accepted tables are.. patient,services and dentist.. we also tried dental history,equipments ..etc.. but only the first three are accepted for our case project.. we need five tables.. and we only have three.. she also said that transaction tables are not allowed errrrrrrrrrrrrrrrrr ,,, i need ...