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- к примеру коннект где есть phone
- id phone id_city 1 5555 2 2
- 6666 2 3 7777 3
- коннект где есть город City
- id_city name
- 1 Лондон
- 2 Париж
- 3 Варшава
- select *
- from phone
- left join City on City.id_city = phone.id_city
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