Что такое "нормальная форма" БД и какие формы существуют.
▫️Что такое нормализация
▫️Что такое избыточность данных - примеры
▫️Какие бывают нормальные формы БД
▫️Ненормализованная форма
▫️Пример нормальной формы
▫️Еще пример
▫️Что такое декомпозиция
▫️Нормальная форма Бойса-Кодда
▫️Четвертая нормальная форма
▫️Почему обычно не нормализуют до 5 или 6 формы
▫️Пятая и шестая нормальная формы
BY SQL для тестировщика
Telegram has made it easier for its users to communicate, as it has introduced a feature that allows more than 200,000 users in a group chat. However, if the users in a group chat move past 200,000, it changes into "Broadcast Group", but the feature comes with a restriction. Groups with close to 200k members can be converted to a Broadcast Group that allows unlimited members. Only admins can post in Broadcast Groups, but everyone can read along and participate in group Voice Chats," Telegram added.
In many cases, the content resembled that of the marketplaces found on the dark web, a group of hidden websites that are popular among hackers and accessed using specific anonymising software.“We have recently been witnessing a 100 per cent-plus rise in Telegram usage by cybercriminals,” said Tal Samra, cyber threat analyst at Cyberint.The rise in nefarious activity comes as users flocked to the encrypted chat app earlier this year after changes to the privacy policy of Facebook-owned rival WhatsApp prompted many to seek out alternatives.SQL для тестировщика from tw