Oracle查询数据库中所有表的记录数

若以上SQL查找不到，执行如下脚本即可：
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
create or replace function count_rows(table_name in varchar2,
                              owner in varchar2 default null)
return number
authid current_user
IS
   num_rows number;
   stmt varchar2(2000);
begin
   if owner is null then
      stmt := "select count(*) from ""||table_name||""";
   else
      stmt := "select count(*) from ""||owner||"".""||table_name||""";
   end if;
   execute immediate stmt into num_rows;
   return num_rows;
end;
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之后，再查select table_name, count_rows(table_name) nrows from user_tables ，OK