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GROUP BY function ret – Mysql

start end category 2022:10:14 17:13:00 2022:10:14 17:19:00 A 2022:10:01 16:29:00 2022:10:01 16:49:00 B 2022:10:19 18:55:00 2022:10:19 19:03:00 A 2022:10:31 07:52:00 2022:10:31 07:58:00 A 2022:10:13 18:41:00 2022:10:13 19:26:00 B The table is sample data about trips the target is to calculate…

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What is the difference in mySQL AND vs Where

I'm using mysql and I confused with "And", "Where" Somby dy can tell me what is difference between these. SELECT *,COUNT(comment.id) as comment_count from posts LEFT JOIN comment on posts.post_id =comment.post_id AND comment.approve = 1 GROUP BY posts.post_id SELECT *,COUNT(comment.id)…

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Aggregate function in MySQL

I have the following table in MySQL which has only two columns. First_name Last_name --------------------------- Babara MacCaffrey Ines Brushfield Freddi Boagey Ambur Roseburgh Clemmie Betchley Elka Twiddell Ilene Dowson Thacher Naseby Romola Rumgay Levy Mynett I want to extract the…

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