Oracle——insert ino,insert all into,insert first into

1、建测试表 

CREATE TABLE EDW_INT
(
  AGMT_NO         VARCHAR2(40 BYTE)             NOT NULL,
  AGMT_SUB_NO     VARCHAR2(4 BYTE)              NOT NULL,
  NEED_REPAY_INT  NUMBER(22,2),
  CURR_PERIOD     NUMBER(4)                     NOT NULL
);
CREATE TABLE EDW_INT_1
(
  AGMT_NO         VARCHAR2(40 BYTE)             NOT NULL,
  AGMT_SUB_NO     VARCHAR2(4 BYTE)              NOT NULL,
  NEED_REPAY_INT  NUMBER(22,2),
  CURR_PERIOD     NUMBER(4)                     NOT NULL
);
CREATE TABLE EDW_INT_2
(
  AGMT_NO         VARCHAR2(40 BYTE)             NOT NULL,
  AGMT_SUB_NO     VARCHAR2(4 BYTE)              NOT NULL,
  NEED_REPAY_INT  NUMBER(22,2),
  CURR_PERIOD     NUMBER(4)                     NOT NULL
);

2、插入测试数据 

INSERT INTO EDW_INT
  (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)
VALUES
  ('20003874', '2104', 3126.5, 7);
INSERT INTO EDW_INT
  (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)
VALUES
  ('20003874', '2104', 3290.76, 6);
INSERT INTO EDW_INT
  (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)
VALUES
  ('20003874', '2104', 3454.06, 5);
INSERT INTO EDW_INT
  (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)
VALUES
  ('20003874', '2104', 3616.41, 4);
INSERT INTO EDW_INT
  (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)
VALUES
  ('20017143', '2104', 2350.86, 0);
INSERT INTO EDW_INT
  (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)
VALUES
  ('20017143', '2104', 3566.55, 0);
INSERT INTO EDW_INT
  (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)
VALUES
  ('20018273', '2104', 1639.46, 0);
INSERT INTO EDW_INT
  (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)
VALUES
  ('20018273', '2104', 2080.49, 0);
COMMIT;

3、insert all/first语句示例

(1)、insert all-不带条件 

insert all
into edw_int_1(agmt_no,agmt_sub_no,need_repay_int,curr_period)
values(agmt_no,agmt_sub_no,need_repay_int,curr_period)
into edw_int_2(agmt_no,agmt_sub_no,curr_period)
values(agmt_no,'1234',curr_period)
select agmt_no,agmt_sub_no,need_repay_int,curr_period from edw_int;
commit;

(2)、insert all-带条件 

insert all
when curr_period=0 then
into edw_int_1(agmt_no,agmt_sub_no,need_repay_int,curr_period)
values(agmt_no,agmt_sub_no,need_repay_int,curr_period)
else
into edw_int_2(agmt_no,agmt_sub_no,need_repay_int,curr_period)
values(agmt_no,agmt_sub_no,need_repay_int,curr_period)
select agmt_no,agmt_sub_no,need_repay_int,curr_period from edw_int;
commit;

(3)、insert first-带条件 

insert first
when curr_period=0 then
into edw_int_1(agmt_no,agmt_sub_no,need_repay_int,curr_period)
values(agmt_no,agmt_sub_no,need_repay_int,curr_period)
when agmt_sub_no='2104' then
into edw_int_2(agmt_no,agmt_sub_no,need_repay_int,curr_period)
values(agmt_no,agmt_sub_no,need_repay_int,curr_period)
select agmt_no,agmt_sub_no,need_repay_int,curr_period from edw_int;
commit;

4、数据结果查看 

truncate table edw_int_1;
truncate table edw_int_2;
select * from edw_int;
select * from edw_int_1;
select * from edw_int_2;

5、all与first的区别

all:不考虑先后关系，只要满足条件，就全部插入；

first:考虑先后关系，如果有数据满足第一个when条件又满足第二个when条件，则执行第一个then插入语句，第二个then就不插入第一个then已经插入过的数据了。

其区别也可描述为，all只要满足条件，可能会作重复插入；first首先要满足条件，然后筛选，不做重复插入。