创建临时事务表只是保存当前会话(session)用到的数据,数据只在事务或会话期间存在,可规避多线程调用数据冲突问题 -- Create table create global temporary table TEM_FI_COURSE_CONFIG ( lgart VARCHAR2(20), komok VARCHAR2(20), sign VARCHAR2(20), lgart1 VARCHAR2(20), sign1 VARCHAR2(20), ktosl VARCHAR2(20), bschs VARCHAR2(20), bschh VARCHAR2(20), konts VARCHAR2(20), konth VARCHAR2(20), neg_postng VARCHAR2(20), col01 VARCHAR2(20), neg_postng_deb VARCHAR2(20), symko VARCHAR2(20) ) on commit delete rows; 查询时临时表with tempName as (select ) select
with as 相当于虚拟视图。
with as短语,也叫做子查询部分(subquery factoring),可以让你做很多事情,定义一个sql片断,该sql片断会被整个sql语句所用到
with tempName as (select ....) select ... --针对一个别名 with tmp as (select * from tb_name) --针对多个别名 with tmp as (select * from tb_name), tmp2 as (select * from tb_name2), tmp3 as (select * from tb_name3), …
原文地址:https://www.cnblogs.com/gongshun/p/10623186.html
时间: 2024-10-18 10:07:03