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postgresql分区表2，
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1). 创建"主表"，所有分区都从它继承。
create table ft
(
sid int not null,sdate date not null,saddress varchar(100)
)tablespace tb01;
2). 创建几个"子"表，每个都从主表上继承
create table ft01
(check ( sdate >= date '2015-01-01' and sdate < date '2015-02-01') )
inherits (ft)
tablespace tb01;
create table ft02
( check ( sdate >= date '2015-02-01' and sdate < date '2015-03-01'))
inherits (ft)
tablespace tb01;
create table ft03
( check ( sdate >= date '2015-03-01' and sdate < date '2015-04-01'))
inherits (ft)
tablespace tb01;
create table ft04
( check ( sdate >= date '2015-04-01' and sdate < date '2015-05-01'))
inherits (ft)
tablespace tb01;
create table ft05
( check ( sdate >= date '2015-05-01' and sdate < date '2015-06-01'))
inherits (ft)
tablespace tb01;
create table ft06
( check ( sdate >= date '2015-06-01' and sdate < date '2015-07-01'))
inherits (ft)
tablespace tb01;
create table ft07
( check ( sdate >= date '2015-07-01' and sdate < date '2015-08-01'))
inherits (ft)
tablespace tb01;
create table ft08
( check ( sdate >= date '2015-08-01' and sdate < date '2015-09-01'))
inherits (ft)
tablespace tb01;
create table ft09
( check ( sdate >= date '2015-09-01' and sdate < date '2015-10-01'))
inherits (ft)
tablespace tb01;
create table ft10
( check ( sdate >= date '2015-10-01' and sdate < date '2015-11-01'))
inherits (ft)
tablespace tb01;
create table ft11
( check ( sdate >= date '2015-11-01' and sdate < date '2015-12-01'))
inherits (ft)
tablespace tb01;
create table ft12
( check ( sdate >= date '2015-12-01' and sdate < date '2016-1-01'))
inherits (ft)
tablespace tb01;
create index index_ft01_sdate on ft01 (sdate) tablespace tb01_index;
create index index_ft02_sdate on ft02 (sdate) tablespace tb01_index;
create index index_ft03_sdate on ft03 (sdate) tablespace tb01_index ;
create index index_ft04_sdate on ft04 (sdate) tablespace tb01_index;
create index index_ft05_sdate on ft05 (sdate) tablespace tb01_index;
create index index_ft06_sdate on ft06 (sdate) tablespace tb01_index;
create index index_ft07_sdate on ft07 (sdate) tablespace tb01_index;
create index index_ft08_sdate on ft08 (sdate) tablespace tb01_index;
create index index_ft09_sdate on ft09 (sdate) tablespace tb01_index;
create index index_ft10_sdate on ft10 (sdate) tablespace tb01_index;
create index index_ft11_sdate on ft11 (sdate) tablespace tb01_index;
create index index_ft12_sdate on ft12 (sdate) tablespace tb01_index;
create or replace function ft_insert_trigger()
returns trigger as $$
begin
if( new.sdate between '2015-1-01' and '2015-02-01' ) then
insert into ft01 values (new.*);
elsif( new.sdate between '2015-2-01' and '2015-03-01' ) then
insert into ft02 values (new.*);
elsif( new.sdate between '2015-3-01' and '2015-04-01' ) then
insert into ft03 values (new.*);
elsif( new.sdate between '2015-4-01' and '2015-05-01' ) then
insert into ft04 values (new.*);
elsif( new.sdate between '2015-05-01' and '2015-06-01' ) then
insert into ft05 values (new.*);
elsif( new.sdate between '2015-06-01' and '2015-07-01' ) then
insert into ft06 values (new.*);
elsif( new.sdate between '2015-07-01' and '2015-08-01' ) then
insert into ft07 values (new.*);
elsif( new.sdate between '2015-08-01' and '2015-09-01' ) then
insert into ft08 values (new.*);
elsif( new.sdate between '2015-09-01' and '2015-10-01' ) then
insert into ft09 values (new.*);
elsif( new.sdate between '2015-10-01' and '2015-11-01' ) then
insert into ft10 values (new.*);
elsif( new.sdate between '2015-11-01' and '2015-12-01' ) then
insert into ft11 values (new.*);
elsif( new.sdate between '2015-12-01' and '2016-01-01' ) then
insert into ft12 values (new.*);
else
raise exception '!out of range!';
end if;
return null;
end;
$$
language plpgsql;
create trigger insert_ft_trigger
before insert on ft
for each row execute procedure ft_insert_trigger() ;
----插入测试数据
insert into ft(sid,sdate,saddress) select n,'2015-01-03',n||':杨楂文'
from generate_series(1,100) n;
insert into ft(sid,'2015-02-04','2015-03-05','2015-04-04','2015-05-05','2015-06-06','2015-07-07','2015-08-08','2015-09-09','2015-10-10','2015-11-11','2015-12-12',100) n;
----查询
SET constraint_exclusion = off;
#EXPLAIN SELECT count(*) FROM ft WHERE sdate >= DATE '2015-01-01';
QUERY PLAN
------------------------------------------------------------------
Aggregate (cost=30.02..30.03 rows=1 width=0)
-> Append (cost=0.00..27.01 rows=1202 width=0)
-> Seq Scan on ft (cost=0.00..0.00 rows=1 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft01 (cost=0.00..2.26 rows=101 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft02 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft03 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft04 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft05 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft06 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft07 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft08 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft09 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft10 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft11 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft12 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
(28 rows)
SET constraint_exclusion = off;
#EXPLAIN SELECT count(*) FROM ft WHERE sdate >= DATE '2015-01-01';
------------------------------------------------------------------
Aggregate (cost=30.02..30.03 rows=1 width=0)
-> Append (cost=0.00..27.01 rows=1202 width=0)
-> Seq Scan on ft (cost=0.00..0.00 rows=1 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft01 (cost=0.00..2.26 rows=101 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft02 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft03 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft04 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft05 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft06 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft07 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft08 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft09 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft10 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft11 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
-> Seq Scan on ft12 (cost=0.00..2.25 rows=100 width=0)
Filter: (sdate >= '2015-01-01'::date)
(28 rows)
# EXPLAIN SELECT count(*) FROM ft WHERE sdate between '2015-03-01' and '2015-04-01';
QUERY PLAN
-----------------------------------------------------------------------------------------
Aggregate (cost=5.25..5.26 rows=1 width=0)
-> Append (cost=0.00..5.00 rows=102 width=0)
-> Seq Scan on ft (cost=0.00..0.00 rows=1 width=0)
Filter: ((sdate >= '2015-03-01'::date) AND (sdate <= '2015-04-01'::date))
-> Seq Scan on ft03 (cost=0.00..2.50 rows=100 width=0)
Filter: ((sdate >= '2015-03-01'::date) AND (sdate <= '2015-04-01'::date))
-> Seq Scan on ft04 (cost=0.00..2.50 rows=1 width=0)
Filter: ((sdate >= '2015-03-01'::date) AND (sdate <= '2015-04-01'::date))
(8 rows)
