使用 PostgreSQL 11，我有下表，大约有 4.5 亿行：
postgres=> \d+ sales
Table "public.sales"
Column | Type | Modifiers | Storage | Stats target | Description
-----------------------------------+-----------------------------+------------------------------------+----------+--------------+-------------
created_terminal_id | integer | not null | plain | |
company_id | integer | not null | plain | |
customer_id | integer | | plain | |
sale_no | character varying(20) | not null | extended | |
sale_type | smallint | not null | plain | |
source_type | smallint | not null | plain …