1、Oracle查询数据库中所有表的记录数，但是有可能不准建议用第二种方式进行查询

select t.table_name,t.num_rows from user_tables t

2、创建oracle函数，通过函数中查询词表记录数显示当前记录数

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;

之后执行：

select table_name, count_rows(table_name) nrows from user_tables

就可以准确查询到记录数