should be it

external/duckdb/benchmark/ldbc/queries/bi-3.sql

@@ -0,0 +1,33 @@
+/* Q3. Popular topics in a country
+\set tagClass '\'MusicalArtist\''
+\set country  '\'Burma\''
+ */
+SELECT f.f_forumid      AS "forum.id"
+     , f.f_title        AS "forum.title"
+     , f.f_creationdate AS "forum.creationDate"
+     , f.f_moderatorid  AS "person.id"
+     , count(DISTINCT p.m_messageid) AS postCount
+  FROM tagClass tc
+     , tag t
+     , message_tag pt
+     , message p
+     , forum f
+     , person m   -- moderator
+     , place  ci  -- city
+     , place  co  -- country
+ WHERE 1=1
+    -- join
+   AND tc.tc_tagclassid = t.t_tagclassid
+   AND t.t_tagid = pt.mt_tagid
+   AND pt.mt_messageid = p.m_messageid
+   AND p.m_ps_forumid = f.f_forumid
+   AND f.f_moderatorid = m.p_personid
+   AND m.p_placeid = ci.pl_placeid
+   AND ci.pl_containerplaceid = co.pl_placeid
+    -- filter
+   AND tc.tc_name = 'MusicalArtist'
+   AND co.pl_name = 'Burma'
+ GROUP BY f.f_forumid, f.f_title, f.f_creationdate, f.f_moderatorid
+ ORDER BY postCount DESC, f.f_forumid
+ LIMIT 20
+;