1.實踐
首先建分區表
create table simng_part (
latn_id number(4) not null,
pname char(200),
mon_id number(2) not null
)
partition by range(latn_id,mon_id)
(
partition part_a01 values less than (2000, 2) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_a02 values less than (2000, 3) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_a12 values less than (2000,13) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b01 values less than (2003, 2) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b02 values less than (2003, 3) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b12 values less than (2003,13) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_d12 values less than (2020,13) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000)
)
/
insert into simng_part values(2000,a,1);
insert into simng_part values(2000,a,2);
insert into simng_part values(2000,a,3);
insert into simng_part values(2002,a,1);
insert into simng_part values(2002,a,3);
insert into simng_part values(2002,a,9);
insert into simng_part values(2019,a,1);
commit;
create table simng_part1 (
latn_id number(4) not null,
pname char(200),
mon_id number(2) not null
)
partition by range(mon_id,latn_id)
(
partition part_a01 values less than ( 2,2000) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b01 values less than ( 2,2003) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_a02 values less than ( 3,2000) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b02 values less than ( 3,2003) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_a12 values less than (13,2000) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_b12 values less than (13,2003) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000),
partition part_d12 values less than (13,2020) tablespace tbs_data pctfree 10 storage(initial 1024k next 1024k maxextents 2000)
)
/
insert into simng_part1 values(2000,a,1);
insert into simng_part1 values(2000,a,2);
insert into simng_part1 values(2000,a,3);
insert into simng_part1 values(2002,a,1);
insert into simng_part1 values(2002,a,3);
insert into simng_part1 values(2002,a,9);
insert into simng_part1 values(2019,a,1);
commit;
2.問題
先思考兩個問題：
試問表simng_part ：part_b01分區中有幾條記錄。
試問表simng_part1 ：part_a01分區中有幾條記錄。
答案是：
latn_id name mon_id
第一個
2002 a 3
2002 a 1
2002 a 9
第二個
2000 a 1
2002 a 1
2019 a 1
查詢如下：
sql> select * from simng_part partition(part_b01);
latn_id pname mon_id
------- ------------- ----------------
2002 a 1
2002 a 3
2002 a 9
sql> select * from simng_part1 partition(part_a01);
latn_id pname mon_id
------- ------------- ----------------
2000 a 1
2002 a 1
2019 a 1
3.結論
關于range partition分區，
首先注意的是，分區不包含上限
同時
對于存在多個列來進行range partition
遵循這個原則：
只要滿足第ｎ列條件，就放在這個分區，而不管第n+1列是否滿足！