标签:ora .sql 基础学习 sel create ble 字段 strong sql
1.SQL执行时间的开关
set timing on ---》开 set timing off---》关
2.创建数据表。以已存在的表创建(也就是复制一个表。但表内没有数据,只有字段)
create table emp10 as select * from emp where 1=2;
*参照emp 表创建
标签:ora .sql 基础学习 sel create ble 字段 strong sql
原文地址:http://www.cnblogs.com/kaiwen/p/7402510.html