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contry_region_city's Introduction

В файле script.sql содержится набор sql комманд для базы данных PostgreSQL.

Сначала создается три таблицы country, region, city.

Далее в этих таблицах создаются записи.

Таблица country содержит список стран.

Таблица region содержит список регионов.

Таблица city содержит список городов.

Таблица region связана с таблицей country через ключ region.country_id.

Таблица city связана с таблицей region через ключ city.region_id.

Всего в базе данных содержится:

Стран: 218

Регионов: 1611

Городов: 17287

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