INNER JOIN vs LEFT JOIN 🔥 | SQL in Real Life Example #dataanalytics #skillcureacademy
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SQL Notes | SQL JOINs Explained Simply | INNER, LEFT, RIGHT, FULL & CROSS JOIN #sql #shorts
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EP32 How to Join 3 Tables in SQL
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Дашборд тормозит 5 секунд на каждой загрузке из-за тяжёлой агрегации? В Postgres это чинится одной командой — без Redis. VIEW не спасёт: это просто сохранённый текст запроса, агрегация гоняется заново каждый раз. А MATERIALIZED VIEW хранит готовый результат на диске — любой SELECT отдаёт его за ~50 мс вместо 5 секунд. В 100 раз быстрее. Нюанс: сам не обновляется — нужен REFRESH (обычно по расписанию). Зато, в отличие от Redis, его можно индексировать, фильтровать в SELECT и джойнить как обычную
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if you have a SQL test coming up for a data analyst interview and you are panicking right, here’s what you need to know LEFT JOIN combines two tables but keeps everything from your main table even when the other table does not have a match. this is on every single SQL test I have ever seen or written COUNT DISTINCT counts unique values. like how many different customers placed an order. not how many total orders. unique. interviewers love asking this because it tells them you actually understand
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Do you always need a comma before so? So is one of the FANBOYS, but it does not always function as a coordinating conjunction. In “I was so tired, so I went to bed early,” the first so means very and does not need a comma. The second so joins two independent clauses, so a comma is required. #GrammarLesson #CommaRules #FANBOYS #LearnEnglish #EnglishTeacher
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TikTokiamthatenglishteacher
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