text: create table chat(
  	c_no number(38) primary key,
  	c_toUserId varchar2(50 char) not null,
  	c_fromUserId varchar2(50 char) not null,
  	c_content varchar2(200 char) not null,
  	c_date date not null
  );
  
  create sequence chat_seq;
  
  insert into chat values(chat_seq.nextval, 'admin', 'junseok', 'Hello', sysdate);
  
  select * from chat;
  
  drop table chat cascade constraint purge;
  