Tabel partisi berdasarkan huruf pertama dari bidang varchar

Anda dapat menggunakan ekspresi di partition by klausa, misalnya:

create table my_table(name text)
partition by list (left(name, 1));

create table my_table_a
partition of my_table
for values in ('a');

create table my_table_b
partition of my_table
for values in ('b');

Hasil:

insert into my_table 
values
    ('abba'), ('alfa'), ('beta');

select 'a' as partition, name from my_table_a
union all
select 'b' as partition, name from my_table_b;

 partition | name 
-----------+------
 a         | abba
 a         | alfa
 b         | beta
(3 rows)

Jika partisi tidak peka huruf besar/kecil, Anda dapat menggunakan

create table my_table(name text)
partition by list (lower(left(name, 1)));

Baca di dokumentasi:

• Partisi Tabel
• BUAT TABEL