declare
v_ename varchar(10);
begin
select ename into v_ename from emp where empno=7844;
dbms_output.put_line(\'雇员名\'||v_ename);
exception
when no_date_found then
dbms_output.put_line(\'你的输入号有误\');
end;
ORA-06550: 第 5 行, 第 ...
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