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????? ???? 3 ??????.
1.city
id
name
2.transaction
id
client_id
amount
timestamp
3.client
id
fullname
city_id
????????? ?????????? ????? ??????? ???? (count)
???????? ? ????????????? ???? ????????? (full_name, total_amount)
???????? ??? 2-? ????????? (full_name, total_amount)
???????? ????? ?? ?????? (city_name, total_amount)
