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SQL GROUP BY

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Learn how GROUP BY works in SQL. Everything you need to know, simply explained with practical examples. 00:00 The Group BY Clause 05:38 Group BY's Golden Rule 14:38 Group BY Practice 25:35 The Hacks of GROUP BY

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SQL Group by Examples

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Один % убил мой индекс — поиск завис на 8 секунд 🔥 LIKE '%foo%' — это ловушка: процент в начале выключает индекс. На миллионе строк — 5 мс против 8 сек. #sql #postgres #postgresql #backend #python #django #программирование #разработка #databases #performance #sqlacademy

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