should be it

external/duckdb/benchmark/ldbc/queries/bi-13.sql

@@ -0,0 +1,34 @@
+/* Q13. Zombies in a country
+\set country '\'Belarus\''
+\set endDate '\'2013-01-01T00:00:00.000+00:00\''::timestamp
+ */
+WITH zombies AS (
+    SELECT p.p_personid AS zombieid
+      FROM place co -- country
+         , place ci -- city
+         , person p
+           LEFT JOIN message m ON (p.p_personid = m.m_creatorid AND m.m_creationdate BETWEEN p.p_creationdate AND '2013-01-01T00:00:00')
+     WHERE 1=1
+        -- join
+       AND co.pl_placeid = ci.pl_containerplaceid
+       AND ci.pl_placeid = p.p_placeid
+        -- filter
+       AND co.pl_name = 'Belarus'
+       AND p.p_creationdate < '2013-01-01T00:00:00'
+     GROUP BY p.p_personid, p.p_creationdate
+        -- average of [0, 1) messages per month is equivalent with having less messages than the month span between person creationDate and parameter :endDate
+    HAVING count(m_messageid) < 12*extract(YEAR FROM '2013-01-01T00:00:00'::date)+extract(MONTH FROM '2013-01-01T00:00:00'::date) - (12*extract(YEAR FROM p.p_creationdate) + extract(MONTH FROM p.p_creationdate)) + 1
+)
+SELECT z.zombieid AS "zombie.id"
+     , count(zl.zombieid) AS zombieLikeCount
+     , count(l.l_personid) AS totalLikeCount
+     , CASE WHEN count(l.l_personid) = 0 THEN 0 ELSE count(zl.zombieid)::float/count(l.l_personid) END AS zombieScore
+  FROM message m
+       INNER JOIN likes l ON (m.m_messageid = l.l_messageid)
+       INNER JOIN person p ON (l.l_personid = p.p_personid AND p.p_creationdate < '2013-01-01T00:00:00')
+       LEFT  JOIN zombies zl ON (p.p_personid = zl.zombieid) -- see if the like was given by a zombie
+       RIGHT JOIN zombies z ON (z.zombieid = m.m_creatorid)
+ GROUP BY z.zombieid
+ ORDER BY zombieScore DESC, z.zombieid
+ LIMIT 100
+;