#посмотреть
▪️Схема базы данных
▪️Таблицы на схеме базы данных
▪️Столбцы таблиц и типы данных в них на схеме базы данных
▪️Связи между таблицами на схеме базы данных
▪️Типы связей между таблицами
▪️Примеры таблиц базы данных онлайн-школы
▪️Пример SQL запроса с JOIN для извлечения данных из таблиц онлайн-школы
▪️Пример использования схемы базы данных для объединения трех таблиц
BY SQL для тестировщика
Bitcoin is a decentralized digital currency that you can buy, sell and exchange directly, without an intermediary like a bank. Bitcoin’s creator, Satoshi Nakamoto, originally described the need for “an electronic payment system based on cryptographic proof instead of trust.” Each and every Bitcoin transaction that’s ever been made exists on a public ledger accessible to everyone, making transactions hard to reverse and difficult to fake. That’s by design: Core to their decentralized nature, Bitcoins aren’t backed by the government or any issuing institution, and there’s nothing to guarantee their value besides the proof baked in the heart of the system. “The reason why it’s worth money is simply because we, as people, decided it has value—same as gold,” says Anton Mozgovoy, co-founder & CEO of digital financial service company Holyheld.
A Telegram spokesman declined to comment on the bond issue or the amount of the debt the company has due. The spokesman said Telegram’s equipment and bandwidth costs are growing because it has consistently posted more than 40% year-to-year growth in users.
SQL для тестировщика from ms