如何解决未找到数据的 plsql 中的错误

Question

I am getting an error in this psql programming that: BIND VARIABLE "END" NOT DECLARED. Please help me with this.

Answer 1

there is absolutley no need for three loops, just join your data and loop once

begin

for i in (select b.bookid,
                 b.title,
                 p.publishername as publisher,
                 a.firstname || ' ' || a.lastname as author
            from books b
      inner join publisher p on b.publisherid = p.publisherid 
      inner join author a on b.author_id = a.authorid) loop
      
      dbms_output.put_line(i.bookid || ' ... ' || i.title || ' ... ' || i.publisher || ' ... ' || i.author);
end loop;

end;