我有这2个错误，ORA-01422 ORA-06512

Question

declare 
    cm Pilote.comm%type;
    dt Pilote.embauche%type;
begin
    select comm, embauche into cm, dt from Pilote;
end;

Answer 1

太多行。您必须限制查询仅返回一行（例如，使用where子句），或者-如果您想选择更多行，则以不同的方式（例如，放入数组）。

例如：

SQL> set serveroutput on;
SQL>
SQL> declare
  2    l_dname dept.dname%type;
  3    l_loc   dept.loc%type;
  4  begin
  5    select dname, loc
  6      into l_dname, l_loc
  7      from dept
  8      where deptno = 10;
  9    dbms_output.put_line(l_dname);
 10  end;
 11  /
ACCOUNTING

PL/SQL procedure successfully completed.

SQL>

或

SQL> declare
  2    type l_dept is table of dept%rowtype;
  3    dept_arr l_dept;
  4  begin
  5    select deptno, dname, loc
  6      bulk collect into dept_arr
  7      from dept;
  8
  9    for i in dept_arr.first .. dept_arr.last loop
 10      dbms_output.put_line(dept_arr(i).dname);
 11    end loop;
 12  end;
 13  /
ACCOUNTING
RESEARCH
SALES
OPERATIONS

PL/SQL procedure successfully completed.

SQL>