should be it

external/duckdb/benchmark/ldbc/queries/bi-7.sql

@@ -0,0 +1,23 @@
+/* Q7. Related Topics
+\set tag '\'Enrique_Iglesias\''
+ */
+SELECT t2.t_name AS "relatedTag.name"
+     , count(*) AS count
+  FROM tag t INNER JOIN message_tag pt ON (t.t_tagid = pt.mt_tagid)
+             -- as an optimization, we don't need message here as it's ID is in message_tag pt
+             -- so proceed to the comment directly
+             INNER JOIN message c      ON (pt.mt_messageid = c.m_c_replyof)
+             -- comment's tag
+             INNER JOIN message_tag ct ON (c.m_messageid = ct.mt_messageid)
+             INNER JOIN tag t2      ON (ct.mt_tagid = t2.t_tagid)
+             -- comment doesn't have the given tag: antijoin in the where clause
+             LEFT  JOIN message_tag nt ON (c.m_messageid = nt.mt_messageid AND nt.mt_tagid = pt.mt_tagid)
+ WHERE 1=1
+    -- join
+   AND nt.mt_messageid IS NULL -- antijoin: comment (c) does not have the given tag
+    -- filter
+   AND t.t_name = 'Enrique_Iglesias'
+ GROUP BY t2.t_name
+ ORDER BY count DESC, t2.t_name
+ LIMIT 100
+;