How to implement LIST Partition by PostgreSQL
Xiaobian to share with you how PostgreSQL implementation LIST partition, I believe most people still do not know how to share this article for your reference, I hope you have a lot of harvest after reading this article, let's go to understand it together!
1. Table construction
create table tbl(a int, b varchar(10));
create table tbl_1 (check ( b = 'jason')) INHERITS (tbl);
create table tbl_2 (check ( b = 'lucy')) INHERITS (tbl);
create table tbl_other (check( b not in ('lucy','jason'))) INHERITS (tbl);
2. Create a function
CREATE OR REPLACE FUNCTION tbl_part_tg()
RETURNS TRIGGER AS $$
BEGIN
IF ( NEW.b = 'jason' ) THEN
INSERT INTO tbl_1 VALUES (NEW.*);
ELSIF ( NEW.b = 'lucy') THEN
INSERT INTO tbl_2 VALUES (NEW.*);
ELSIF (NEW.b not in ('jason','lucy')) THEN
INSERT INTO tbl_other VALUES (NEW.*);
END IF;
RETURN NULL;
END;
$$
LANGUAGE plpgsql;
3. Create a trigger
CREATE TRIGGER insert_tbl_part_tg
BEFORE INSERT ON tbl
FOR EACH ROW EXECUTE PROCEDURE tbl_part_tg();
4. Insert data
insert into tbl values(1,'jason');
insert into tbl values(2,'lucy');
insert into tbl values(3,'baichi');
insert into tbl values(4,'baichi1');
insert into tbl values(5,'baichi2');
5. Results
postgres=# select * from tbl_1;
a | b
---+-------
1 | jason
(1 row)
postgres=# select * from tbl_2;
a | b
---+------
2 | lucy
(1 row)
postgres=# select * from tbl_other;
a | b
---+---------
3 | baichi
4 | baichi1
5 | baichi2
(3 rows)
postgres=# select * from tbl;
a | b
---+---------
1 | jason
2 | lucy
3 | baichi
4 | baichi1
5 | baichi2
(5 rows)
postgres=#
That's all for PostgreSQL How to Implement LIST Partitioning. Thanks for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!
