ORACLE创建临时事务表global temporary table 和 查询时临时表with tempName as (select ) select

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),
   …