text: set grammar to oracle;
  select bitand(1,3) from dual;
  select bitand('1',3) from dual;
  select bitand(127,3.9456) from dual;
  select bitand('1.4999',1.4999) from dual;
  select bitand(-1,-1) from dual;
  select bitand('-3',2) from dual;
  select bitand(127.99,'128.99') from dual;
  select bitand('-127','128') from dual;
  select bitand(exp(2),exp(2)) from dual;
  select bitand(to_char(4),0) from dual;
  select bitand(3*3,2*4) from dual;
  select bitand('s',0) from dual;
  select bitand('',0) from dual;
  select bitand('',null) from dual;
  select bitand(null,2) from dual;
  