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Update 1264. Page Recommendations.sql

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Original file line number	Diff line number	Diff line change
`@@ -16,3 +16,27 @@ FROM likes_1264`
`16`	`16`	`WHERE user_id IN (SELECT * FROM friends) AND`
`17`	`17`	`page_id NOT IN (SELECT DISTINCT page_id FROM likes_1264 WHERE user_id = 1)`
`18`	`18`	`ORDER BY 1;`
	`19`	`+`
	`20`	`+--------------------------- OR ----------------------------`
	`21`	`+`
	`22`	`+WITH likes AS (`
	`23`	`+ SELECT user_id,ARRAY_AGG(page_id) as liked_pages`
	`24`	`+ FROM likes_1264`
	`25`	`+ GROUP BY user_id`
	`26`	`+),friends AS (`
	`27`	`+ SELECT user_id1,user_id2,page_id`
	`28`	`+ FROM friendship_1264 f`
	`29`	`+ JOIN likes_1264 l ON f.user_id1 = l.user_id`
	`30`	`+ UNION ALL`
	`31`	`+ SELECT user_id2,user_id1,page_id`
	`32`	`+ FROM friendship_1264 f`
	`33`	`+ JOIN likes_1264 l ON f.user_id2 = l.user_id`
	`34`	`+),reco AS(`
	`35`	`+ SELECT f.user_id1 AS from_user, f.user_id2 AS friend, f.page_id AS page_to_reco, liked_pages AS friend_already_liked_pages`
	`36`	`+ FROM friends f`
	`37`	`+ JOIN likes l ON f.user_id2 = l.user_id AND (NOT f.page_id = ANY (liked_pages))`
	`38`	`+)`
	`39`	`+SELECT DISTINCT page_to_reco`
	`40`	`+FROM reco`
	`41`	`+WHERE friend = 1`
	`42`	`+ORDER BY page_to_reco;`

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