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SQL: история, теория и практика

Плейлист с подробным разбором SQL — языка, знание которого нужно практически всем тестировщикам. Более 15 часов видео.

◽️Часть 1.1 История возникновения
◽️Часть 1.2 Нормализация
◽️Часть 1.3 Проектирование схемы данных
◽️Часть 2.1 Операторы и практика работы с запросами
◽️Часть 2.2 Практика работы с запросами
◽️Часть 3.1 Вложенные запросы
◽️Часть 3.2 Вложенные запросы
◽️Часть 4.1 Приемы анализа и оптимизации запросов
◽️Часть 5.1 Дополнительные средства некоторых баз данных
◽️Часть 5.2 Дополнительные средства некоторых баз данных

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The global forecast for the Asian markets is murky following recent volatility, with crude oil prices providing support in what has been an otherwise tough month. The European markets were down and the U.S. bourses were mixed and flat and the Asian markets figure to split the difference.The TSE finished modestly lower on Friday following losses from the financial shares and property stocks.For the day, the index sank 15.09 points or 0.49 percent to finish at 3,061.35 after trading between 3,057.84 and 3,089.78. Volume was 1.39 billion shares worth 1.30 billion Singapore dollars. There were 285 decliners and 184 gainers.

How to Invest in Bitcoin?

Like a stock, you can buy and hold Bitcoin as an investment. You can even now do so in special retirement accounts called Bitcoin IRAs. No matter where you choose to hold your Bitcoin, people’s philosophies on how to invest it vary: Some buy and hold long term, some buy and aim to sell after a price rally, and others bet on its price decreasing. Bitcoin’s price over time has experienced big price swings, going as low as $5,165 and as high as $28,990 in 2020 alone. “I think in some places, people might be using Bitcoin to pay for things, but the truth is that it’s an asset that looks like it’s going to be increasing in value relatively quickly for some time,” Marquez says. “So why would you sell something that’s going to be worth so much more next year than it is today? The majority of people that hold it are long-term investors.”

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