set serveroutput on 


declare
  t_count   number(10);
  t_str VARCHAR2(500);
  cursor t_tables is select table_name from user_tables;
begin
  for t_row in t_tables loop
    t_str := 'select count(*) from '|| t_row.table_name;
    execute immediate t_str into t_count;
    dbms_output.put_line( t_row.table_name || '=' || to_char(t_count));
  end loop;
end;

本文标题：Oracle统计某个用户下所有表的各自行数
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