text: drop sequence pur#_seq;
  drop sequence sup#_seq;
  drop sequence log#_seq;
  
  create sequence pur#_seq
  increment by 1
  start with 100015
  order;
  
  create sequence sup#_seq
  increment by 1
  start with 1010 maxvalue 9999
  order
  cycle;
  
  create sequence log#_seq
  increment by 1
  start with 10000 maxvalue 99999
  order;