Improve MCC query

Author: bbimber

mcc/resources/queries/study/demographicsLittermates.sql

@@ -1,16 +1,10 @@
 SELECT
 
-d1.Id,
-d1.litterId,
+    d1.Id,
+    d1.litterId,
 
-GROUP_CONCAT(distinct d2.Id, ',') as litterMates
+    (SELECT GROUP_CONCAT(distinct d2.Id, ',') as litterMates FROM study.Demographics d2 WHERE d2.qcstate.publicdata = true AND d1.litterId = d2.litterId AND d1.id != d2.id) as litterMates
 
 FROM study.Demographics d1
 
-JOIN study.Demographics d2 ON (d1.litterId = d2.litterId AND d1.id != d2.id)
-
-WHERE
-    d1.qcstate.publicdata = true AND
-    d2.qcstate.publicdata = true
-
-GROUP BY d1.Id, d1.litterId
+WHERE d1.qcstate.publicdata = true