I’m trying to build a query for a leaderboard comprising the things that matter to us during the last month: Likes received Topics solved Badges gained I started with the User Participation query, stripped out what I didn’t want/need, and then started with adding badges gained. The badges gained query by itself looks like: -- [params] -- string :interval = 1 month -- string :trunc = month SELECT user_id, count(id) FROM user_badges WHERE granted_at > date_trunc(:trunc, CURRENT_TIMESTAMP - INTERVAL :interval) AND granted_at < date_trunc(:trunc, CURRENT_TIMESTAMP) GROUP BY user_id ORDER BY count DESC That works just fine, but then when I try to convert it into the modified User Participation query, that’s where my head explodes: -- [params] -- string :interval = 1 month -- string :trunc = month with t as ( select date_trunc(:trunc, CURRENT_TIMESTAMP - INTERVAL :interval) as start, date_trunc(:trunc, CURRENT_TIMESTAMP) as end ), pr as ( select user_id, count(1) as visits, sum(posts_read) as posts_read from user_visits, t where posts_read > 0 and visited_at > t.start and visited_at t.start and post_actions.created_at t.start AND granted_at < t.end AND pr.user_id = b.user_id GROUP BY b.user_id ) select pr.user_id, username, name, email, visits, coalesce(likes_received,0) as likes_received, coalesce(badges,0) as badges_recv from pr left join lr using (user_id) left join e using (user_id) left join users on pr.user_id = users.id order by likes_received desc, visits desc I’m getting the following error (and I haven’t even started trying to add in Topics Solved): PG::UndefinedColumn: ERROR: column "badges" does not exist LINE 65: coalesce(badges,0) as badges_recv ^ Which doesn’t really make sense to me since badges is clearly identified… So I am a bit stuck… Any help finishing this query with adding badges received and topics solved would be appreciated!

[תמונה] jerdog: left join users on pr.user_id = users.id I think you just need to add a join in there: left join b on b.user_id = users.id

Ahh hell yes! Thanks! Now I need to figure out adding the topics solved to this

ok so to come back to this as I have moved down the path a fair bit… trying to restrict to only a specific group, and then to all but a specific group (two separate queries). -- User participation -- [params] -- string :interval = 1 month -- string :trunc = month with t as ( select date_trunc(:trunc, CURRENT_TIMESTAMP - INTERVAL :interval) as start, date_trunc(:trunc, CURRENT_TIMESTAMP) as end ), pr as ( select user_id, count(1) as visits, sum(posts_read) as posts_read from user_visits, t where posts_read > 0 and visited_at > t.start and visited_at t.start and post_actions.created_at 1 AND (p.created_at > t.start and p.created_at t.start AND granted_at < t.end AND pr.user_id = b.user_id GROUP BY b.user_id ) select pr.user_id, username, name, email, visits, coalesce(likes_received,0) as likes_recv, coalesce(replies,0) as replies_made, coalesce(badges,0) as badges_recv, ((coalesce(likes_received,0) * 2) + (coalesce(replies,0) * 1) + (coalesce(badges,0) * 3)) as total_points from pr left join lr using (user_id) left join e using (user_id) left join users on pr.user_id = users.id left join b on b.user_id = users.id left join r on r.user_id = users.id order by total_points desc NULLS LAST Not sure where I would put the bits for that?

pinging @simon to see if he has any thoughts here

[תמונה] jerdog: trying to restrict to only a specific group, and then to all but a specific group (two separate queries). I think you could create another WITH query to get the users who belong to a group, and then do an inner join to the in_group table in your final query. This should exclude any records that don’t have a user_id in the in_group table -- returns user_ids for a named group WITH in_group AS ( SELECT gu.user_id FROM group_users gu JOIN groups g ON g.id = gu.group_id WHERE g.name = :group_name ) If you want another query that excludes the members of a group, you could do something like this not_in_group AS ( SELECT u.id FROM users u WHERE u.id NOT IN (SELECT * FROM in_group) )

So I added the following based on group ID instead of name in_group AS ( SELECT gu.user_id FROM group_users gu JOIN groups g ON g.id = gu.group_id WHERE g.id = 41 ) and then added in the left join left join in_group on in_group.user_id = users.id and the same list appears - didn’t change anything.

[תמונה] jerdog: and then added in the left join Using a LEFT JOIN is the problem here. You need to use an INNER JOIN so that only records that match in both tables are returned. An INNER JOIN can be written as just JOIN. This is a helpful article: A Visual Explanation of SQL Joins.

Doh… I hate joins… =) Thanks mate!

So @simon I have another question around this… I am breaking things down for badges, giving different weight to which badge type… and getting a weird error when I try to add things together: PG::SyntaxError: ERROR: syntax error at or near "+" LINE 97: ...sce(badges1,0) * 3)) + (coalesce(badges2,0) * 2)) + (coalesc... ^ I am using “+” elsewhere in that line and it’s fine, but as soon as I try to break it down it gives that error… Here is the query (wall of text hidden by spoiler): Query -- User participation -- [params] -- string :trunc = Day -- string :interval = 1 day -- string :start = 2018-06-01 00:00:00.000000 -- string :end = 2018-06-30 23:59:59.999999 with --t as ( -- select date_trunc(:trunc, CURRENT_TIMESTAMP - INTERVAL :interval) as start, -- date_trunc(:trunc, CURRENT_TIMESTAMP) as end --), pr as ( select user_id, count(1) as visits, sum(posts_read) as posts_read from user_visits where posts_read > 0 and visited_at between :start and :end group by user_id ), likes as ( select post_actions.user_id as given_by_user_id, posts.user_id as received_by_user_id from post_actions left join posts on post_actions.post_id = posts.id where post_actions.created_at between :start and :end and post_action_type_id = 2 ), lr as ( select received_by_user_id as user_id, count(1) as likes_received from likes group by user_id ), e as ( select email, user_id from user_emails u where u.primary = true ), r as ( SELECT p.user_id, count(p.id) as replies FROM posts p, pr WHERE p.post_type = 1 AND p.post_number > 1 AND (p.created_at between :start and :end) and p.user_id not in ('-1', '-2') AND pr.user_id = p.user_id AND p.topic_id not in ('4','24','26','32','33','34','35','36','37','38','39','40') GROUP BY p.user_id), b1 as ( SELECT b1.user_id, count(1) as badges1 FROM user_badges b1, pr WHERE granted_at between :start and :end AND pr.user_id = b1.user_id AND b1.badge_id in (select id from badges where badge_type_id = 1) GROUP BY b1.user_id ), b2 as ( SELECT b2.user_id, count(1) as badges2 FROM user_badges b2, pr WHERE granted_at between :start and :end AND pr.user_id = b2.user_id AND b2.badge_id in (select id from badges where badge_type_id = 2) GROUP BY b2.user_id ), b3 as ( SELECT b3.user_id, count(1) as badges3 FROM user_badges b3, pr WHERE granted_at between :start and :end AND pr.user_id = b3.user_id AND b3.badge_id in (select id from badges where badge_type_id = 3) GROUP BY b3.user_id ) select pr.user_id, username, name, email, visits, coalesce(likes_received,0) as likes_recv, coalesce(replies,0) as replies_made, coalesce(badges1,0) as badges1_recv, coalesce(badges2,0) as badges2_recv, coalesce(badges3,0) as badges3_recv, ((coalesce(likes_received,0) * 2) + (coalesce(replies,0) * 1) + (coalesce(badges1,0) * 3)) + (coalesce(badges2,0) * 2)) + (coalesce(badges3,0) * 1)) as total_points from pr left join lr using (user_id) left join e using (user_id) left join users on pr.user_id = users.id left join b1 on b1.user_id = users.id left join b2 on b2.user_id = users.id left join b3 on b3.user_id = users.id left join r on r.user_id = users.id order by total_points desc NULLS LAST

It is not a weird error, the code has a Syntax Error. Maybe you can see the issue better this way? ( (coalesce(likes_received,0) * 2) + (coalesce(replies,0) * 1) + (coalesce(badges1,0) * 3) ) + (coalesce(badges2,0) * 2) ) + (coalesce(badges3,0) * 1) ) as total_points

DOH! I missed my parentheses… thanks!

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mcwumbly (Dave McClure) 3 במאי,‏ 2018,‏ 1:41pm 2

I think you just need to add a join in there:

left join b on b.user_id = users.id

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