ocp 试题学习中 _转子查询返回的数据行是如何用来插入多个表中

http://www.itpub.net/thread-1802215-1-1.html  转


多表插入――有条件的insert all [复制链接]

子查询返回的数据行是如何用来插入多个表中
small_customers
medium_customers
large_customers

create table small_customers(customer_id number,sum_orders number);

create table medium_customers(customer_id number,sum_orders number);

create table large_customers(customer_id number,sum_orders number);

create table  orders(customer_id number,order_total number);

insert into orders values(1,200);
insert into orders values(1,400);
insert into orders values(2,50000);
insert into orders values(2,80000);
insert into orders values(3,200000);
insert into orders values(3,2000);


insert all
when sum_orders < 10000 then
into small_customers
when sum_orders >= 10000 and sum_orders < 200000 then
into medium_customers
else
into large_customers
select customer_id,sum(order_total) sum_orders
from orders
group by customer_id;
commit;

SQL> select * from small_customers;

CUSTOMER_ID SUM_ORDERS
----------- ----------
          1        600

SQL> select * from medium_customers;

CUSTOMER_ID SUM_ORDERS
----------- ----------
          2     130000

SQL> select * from large_customers;

CUSTOMER_ID SUM_ORDERS
----------- ----------
          3     202000