查看當前用戶下有哪些表(找表)
select table_name from user_tab_comments;
查看當前用戶下的表記錄數(查看記錄數)
select table_name, num_rows from user_tables where num_rows > 0 order by num_rows desc;
查看當前用戶下有哪些字段(根據字段名找表)
select table_name, column_name from user_tab_columns where instr(column_name, '列名關鍵字')>0;