explain
select sql_no_cache * from record order by regtime asc limit 20000,30;
explain
select sql_no_cache r.* from record r join (select id from record order by regtime asc limit 20000,30) t on t.id=r.id
explain
select sql_no_cache * from record order by regtime asc limit 20000,30;
explain
select sql_no_cache r.* from record r join (select id from record order by regtime asc limit 20000,30) t on t.id=r.id
默認的:最高權限用戶:system 密碼:manager(我自己system) 管理員權限用戶:sys 密碼:change_on_install 普通用戶:scott