Exploring declarative partitioning

In this section, we will talk about declarative partitioning. It is available in PostgreSQL starting from version 10, but it is best in version 12 in terms of features and performance. We will now look at an example of partitioning by range and an example of partitioning by list.

List partitioning

In the first example of declarative partitioning, we will use the same example as we looked at when we introduced partitioning using inheritance. We will see that things become much simpler using the declarative partitioning method:

1. First of all, let's drop the parent table and its child tables that we made previously:

DROP TABLE IF EXISTS part_tags cascade;

2. Now let's recreate the same tables using the declarative method. First, we must define our parent table:

CREATE TABLE part_tags (
 pk INTEGER NOT NULL DEFAULT nextval('part_tags_pk_seq') , 
 level INTEGER NOT NULL DEFAULT 0,
 tag VARCHAR (255) NOT NULL,
 primary key (pk,level)
)
PARTITION...