无条件的插入

Oracle中的insert all是指把同一批数据插入到不同的表中，假如如今有个需求：把t表中的数据分别插入t1,t2，假设你不知道insert all，你可能会使用insert插入2次，例如以下所看到的：

insert  into t1(object_name,object_id) select * from t;
insert  into t2(object_name,object_id) select * from t;
commit;

insert all
into t1(object_name,object_id)
into t2(object_name,object_id)
select * from t;
commit;

有条件的插入

--insert first
--前面等于1的条件被<=5含在内，FIRST就表示前面插入了，后面不会再插入了。
insert first
when object_id = 1 then
into t1(object_name,object_id)
when object_id <=5 then                      
into t2(object_name,object_id)
select * from t;
commit;

select * from t1;

OBJECT_NAME                OBJECT_ID
--------------------------------- ---
ICOL$                              1

select * from t2;

OBJECT_NAME                OBJECT_ID
--------------------------------- ---
I_USER1                            2
CON$                               3
UNDO$                              4
C_COBJ#                            5

--insert all
insert all
when object_id = 1 then
into t1(object_name,object_id)
when object_id <=5 then                      
into t2(object_name,object_id)
select * from t;
commit;

SQL> select * from t1;

OBJECT_NAME                OBJECT_ID
--------------------------------- ---
ICOL$                              1
SQL> select * from t2;

OBJECT_NAME                OBJECT_ID
--------------------------------- ---
ICOL$                              1
I_USER1                            2
CON$                               3
UNDO$                              4
C_COBJ#                            5

行转列插入

select * from sales_source_data;
EMPLOYEE_ID    WEEK_ID  SALES_MON  SALES_TUE  SALES_WED SALES_THUR  SALES_FRI
----------- ---------- ---------- ---------- ---------- ---------- ----------
        176          6       2000       3000       4000       5000       6000

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;

select * from sales_info;
EMPLOYEE_ID       WEEK      SALES
----------- ---------- ----------
        176          6       2000
        176          6       3000
        176          6       4000
        176          6       5000
        176          6       6000