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▪️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
The S&P 500 slumped 1.8% on Monday and Tuesday, thanks to China Evergrande, the Chinese property company that looks like it is ready to default on its more-than $300 billion in debt. Cries of the next Lehman Brothers—or maybe the next Silverado?—echoed through the canyons of Wall Street as investors prepared for the worst.
n the U.S. people generally use Bitcoin as an alternative investment, helping diversify a portfolio apart from stocks and bonds. You can also use Bitcoin to make purchases, but the number of vendors that accept the cryptocurrency is still limited. Big companies that accept Bitcoin include Overstock, AT&T and Twitch. You may also find that some small local retailers or certain websites take Bitcoin, but you’ll have to do some digging. That said, PayPal has announced that it will enable cryptocurrency as a funding source for purchases this year, financing purchases by automatically converting crypto holdings to fiat currency for users. “They have 346 million users and they’re connected to 26 million merchants,” says Spencer Montgomery, founder of Uinta Crypto Consulting. “It’s huge.”
SQL для тестировщика from cn