+create index i_prn_name on printers (name);
+create index i_prn_dname on printers (duplexname);
+create index i_prn_mach on printers (mach_id);
+create index i_prn_rm on printers (rm);
+create index i_prn_loc on printers (location);
+create index i_prn_con on printers (contact);