如何修复此"忽略SQL语句"错误？

Question

我有以下不编译的小函数:

function f_query_01  Return interval Day to second is 
  start_time timestamp(3);
  end_time timestamp(3);
  time_diff interval Day to second;  
  c_query_number number;

begin

  start_time := systimestamp; 
  select count(*) into c_query_number from wg;  <--This is the line that errors out
  end_time := systimestamp;
  time_diff := start_time - end_time;

  return time_diff;

end f_query_01;

编译器给我以下错误:

Error(29,3): PL/SQL: SQL Statement ignored
Error(29,44): PL/SQL: ORA-04044: procedure, function, package, or type is not allowed here

导致此错误的原因是什么？如何解决？

Answer 1

表格wg似乎不存在.当更新到正确的表名时,编译工作没有错误.来自表的编译器的消息不存在将是最有帮助的.