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declare
v_tbname varchar2(30);
v_sql varchar2(100);
emp_row emp%rowtype;
begin
select sname into v_tbname from a where a.id=100;
dbms_output.put_line(v_tbname);
v_sql:='select * from '||v_tbname ||' where ROWNUM=1' ;
dbms_output.put_line(v_sql);
execute immediate v_sql into emp_row;
dbms_output.put_line(emp_row.ename||' '||emp_row.SAL||' '||emp_row.JOB);
end;