insert all是oracle中用于批量写数据的
现在直接通过例子学习一下，比较简单直观，例子来自《收获，不止SQL优化》一书
环境准备
create table t as select object_name,rownum as object_id from dba_objects where rownum<=10;创建两张测试表，不用写数据
create table t1 as select * from t where 1=2; create table t2 as select * from t where 1=2;然后演示一下insert all的用法
无条件写数据的情况
insert all into t1 (object_name, object_id) into t2 (object_name, object_id) select * from t; commit;有条件写数据的情况
truncate table t1; truncate table t2; insert all when object_id < 5 then into t1 (object_name, object_id) when object_id >= 5 then into t2 (object_name, object_id) select * from t; commit;insert first
insert first情况，介绍一下insert first的用法，insert first用法和insert all类似，区别的是insert first多了筛选的步骤，简单来说就是和insert all一样，符合条件的同样会写数据，不过已经存在数据了，insert first是不会写入的，而insert all是会出现重复数据的情况
pivoting insert
然后再演示一下pivoting insert的情况，pivoting insert可以说是insert all的一直特殊情况，不过oracle官方还是区分出来，pivoting insert可以翻译为旋转写入，名称的不重要，看一下例子就懂了
环境准备
drop table sales_source_data; create table sales_source_data( employee_id number(10), week_id number(2), sales_mon number(8,2), sales_tue number(8,2), sales_wed number(8,2), sales_thur number(8,2), sales_fri number(8,2) ); insert into sales_source_data values(280,6,2000,3000,4000,5000,6000); commit; create table sales_info( employee_id number(10), week number(2), sales number(8,2) );按照条件进行写数据
insert all into sales_info values(employee_id,week_id,sales_mon) into sales_info values(employee_id,week_id,sales_tue) into sales_info values(employee_id,week_id,sales_wed) into sales_info values(employee_id,week_id,sales_thur) into sales_info values(employee_id,week_id,sales_fri) select employee_id,week_id,sales_mon,sales_tue, sales_wed,sales_thur,sales_fri from sales_source_data; commit;