plsql实现统计员工入职年份人数

--统计公司员工入职年份的员工数

declare
cursor p_cursor is select to_char(hiredate,'YYYY' ) from emp;
p_hiredate char(10);
count80 number:=0;
count81 number:=0;
count87 number:=0;
count82 number:=0;
begin
open p_cursor;
loop
fetch p_cursor into p_hiredate;
exit when p_cursor%notfound;

if p_hiredate='1980' then count80:=count80+1;
elsif p_hiredate='1981' then count81:=count81+1;
elsif p_hiredate='1987' then count87:=count87+1;

else count82:=count82+1;
end if;
end loop;

close p_cursor;

dbms_output.put_line(count80);
dbms_output.put_line(count81);
dbms_output.put_line(count87);
dbms_output.put_line(count82);
end;