打開已用時間
set timing on;
create table users(id number(20), name varchar2(20), password varchar2(20));
insert into users values(111111111111111, ‘愛新覺羅·啟星‘, ‘[email protected]‘);
insert into users(id, name, password) select * from users; // 插入32768條數據
select * from users; 用時40.58秒
select name from users; 用時23.34秒
select * from users; 用時38.58秒
select name from users; 用時23.91秒
select * from users; 用時39.47秒
select name from users; 用時24.28秒

為什麽不要使用 select * from xxx (oracle 親測)