警告：已编译但编译错误oracle编译pl / sql错误

Question

嗨我是新来的，也是新的oracle pl / sql块这是编译它的代码返回警告：编译但编译错误

 create or replace function func_o12 return varchar2
       is
         declare nn varchar2(20);
     begin
        select
              case substr(1234,1,3)
                  when '134' then '1234 is a match'
                  when '1235' then '1235 is a match'
                  when concat('1','23') then concat('1','23')||' is a match'
              else 'no match'
              end
         into :nn  
           from dual;
       return :nn;
      end;

Answer 1

您不需要声明或绑定标记：

create or replace function func_o12 return varchar2
       is
         nn varchar2(20);
     begin
        select
              case substr(1234,1,3)
                  when '134' then '1234 is a match'
                  when '1235' then '1235 is a match'
                  when concat('1','23') then concat('1','23')||' is a match'
              else 'no match'
              end
         into nn  
           from dual;
       return nn;
      end;