drop table tasks;

create table tasks (
   b_id decimal(6),
   t_id decimal(6),
   c_modelsql char(8),
   c_modelresult char(8),
   c_studentsql char(8),
   c_diagnosis char(8),
   c_hint char(8),
   c_link char(8),
   t_def varchar(255) not null,
   t_sql varchar(255),
   t_hint varchar(255),
   t_link varchar(255),
   t_nextgood decimal(6),
   t_nextbad decimal(6)
);