错误报告:ORA-06550:第7行，第134列:PL/SQL: ORA-00913:值太多ORA-06550:第7行，

>        set serveroutput on  
>        set autoprint on;  
>       declare  
>       v_first_name employees.first_name%type;  
>       v_street_address locations.street_address%type;   
>       v_city locations.city%type;    
>       v_postal_code locations.postal_code%type;   
>       begin   
>       select employee_id first_name,street_address,city,postal_code       into:b_employee_id,v_first_name,v_street_address,v_city,v_postal_code 
> 
>       from employees   natural join locations    
>     where employee_id=156;    // how to get employee_id stored in b_employee_ud
>     dbms_output.put_line('the employee'||v_first_name ||' is located    at:'||v_street_address||   v_city ||v_postal_code );    
>     end;     
>     /
>        set serveroutput on  
>        set aut