add hw1 and hw2#3
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ardan09 wants to merge 1 commit into
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nikb-de
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Mar 29, 2021
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Вообще .DS_Store лучше в .gitignore всегда добавлять
По непрокомментированным файлам отвечу чуть позже
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| /* Вывести все альбомы со средней длинной трека, большей 250 секунд. | |||
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| /* Для каждого набора жанр, тип медиа вывести количество треков. | |||
| * Вывести имя артиста, количество треков. (artist_name, qty) | ||
| */ | ||
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| select ar."name" as artist_name |
| , count(distinct c.customer_id) as customers_count | ||
| , count(distinct i.invoice_id) as invoices_count | ||
| , count(distinct i.billing_address) as addresses_count | ||
| , count(iline.track_id) as tracks_count |
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Некорректно подсчитано количество купленных треков
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| /* Выполнить сегментацию клиентов по количеству букв "а" в его фамилии - Группа 'A' - 0 букв, 'B' - 1 буква, 'C' - 2 буквы, 'D' - 3 и более букв. | |||
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