text: create table instructor_details
  (
  	id serial not null
  		constraint instructor_details_pk
  			primary key,
  	youtube_channel varchar(100) not null,
  	hobby varchar(50) not null
  );
  
  create table instructor
  (
  	id serial not null
  		constraint instructor_pk
  			primary key,
  	first_name varchar(50) not null,
  	last_name varchar(50) not null,
  	email varchar(50),
  	instructor_detail_id int
  		constraint instructor_instructor_details_id_fk
  			references instructor_details
  				on update cascade on delete cascade
  );
  
  