Oracle查詢數據庫中所有表的記錄數

1、Oracle查詢數據庫中所有表的記錄數，但是有可能不准建議用第二種方式進行查詢

　　　　select t.table_name,t.num_rows from user_tables t

2、創建oracle函數，通過函數中查詢詞表記錄數顯示當前記錄數

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;

之后執行：select table_name, count_rows(table_name) nrows from user_tables 

就可以准確查詢到記錄數