#посмотреть
▫️Что такое оконные функции SQL
▫️Зачем нужны
▫️Примеры использования
▫️Синтаксис
▫️Разница оконных функций и GROUP BY
▫️Классы оконных функций
▫️SUM
▫️AVG
▫️COUNT
▫️MIN / MAX
▫️ROW_NUMBER
▫️RANK
▫️DENSE_RANK
▫️NTILE
▫️LAG
▫️LEAD
▫️FIRST_VALUE / LAST_VALUE
▫️NTH_VALUE
или
BY SQL для тестировщика
Telegram has no known backdoors and, even though it is come in for criticism for using proprietary encryption methods instead of open-source ones, those have yet to be compromised. While no messaging app can guarantee a 100% impermeable defense against determined attackers, Telegram is vulnerabilities are few and either theoretical or based on spoof files fooling users into actively enabling an attack.
The messaging service and social-media platform owes creditors roughly $700 million by the end of April, according to people briefed on the company’s plans and loan documents viewed by The Wall Street Journal. At the same time, Telegram Group Inc. must cover rising equipment and bandwidth expenses because of its rapid growth, despite going years without attempting to generate revenue.
SQL для тестировщика from de