Commit a6fda29

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Adding Solutions

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	`1`	`+WITH posts AS (`
	`2`	`+ SELECT *`
	`3`	`+ FROM submissions_1241`
	`4`	`+ WHERE parent_id IS NULL`
	`5`	`+),`
	`6`	`+cmnts AS (`
	`7`	`+ SELECT *`
	`8`	`+ FROM submissions_1241`
	`9`	`+ WHERE parent_id IS NOT NULL`
	`10`	`+),`
	`11`	`+cte AS (`
	`12`	`+ SELECT DISTINCT p.sub_id AS post_id,c.sub_id AS cmnt_id`
	`13`	`+ FROM posts p`
	`14`	`+ LEFT JOIN cmnts c`
	`15`	`+ ON p.sub_id = c.parent_id`
	`16`	`+)`
	`17`	`+SELECT post_id,COUNT(cmnt_id)`
	`18`	`+FROM cte`
	`19`	`+GROUP BY post_id`
	`20`	`+ORDER BY post_id;`

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	`1`	`+SELECT u.product_id,ROUND(SUM(u.units*p.price)::NUMERIC/SUM(u.units),2)`
	`2`	`+FROM unit_sold_1251 u`
	`3`	`+INNER JOIN prices_1251 p`
	`4`	`+ON u.purchase_date BETWEEN p.start_date AND p.end_date AND`
	`5`	`+ u.product_id = p.product_id`
	`6`	`+GROUP BY u.product_id;`

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	`1`	`+WITH exams AS (`
	`2`	`+ SELECT student_id,subject_name,COUNT(1) AS attended_exams`
	`3`	`+ FROM examinations_1280`
	`4`	`+ GROUP BY student_id,subject_name`
	`5`	`+),`
	`6`	`+combinations AS (`
	`7`	`+ SELECT st.*,sb.subject_name`
	`8`	`+ FROM students_1280 st`
	`9`	`+ CROSS JOIN subjects_1280 sb`
	`10`	`+)`
	`11`	`+SELECT c.student_id,c.student_name,c.subject_name,COALESCE(e.attended_exams,0)`
	`12`	`+FROM combinations c`
	`13`	`+LEFT JOIN exams e ON e.student_id = c.student_id AND e.subject_name = c.subject_name`
	`14`	`+ORDER BY c.student_id,c.subject_name;`