Customer card: projection with aliases

At "Kotomarket" the marketing team prepares a customer export for a mailing and wants the column headers to be readable. The customers table holds the shop's customer data. For every customer, output three columns, renaming them with AS: - full_name as klient; - city as gorod; - signup_date as data_registracii. No filtering, sorting or other transformations are required — just a projection of the needed columns with aliases.