add SQL for duplicates check

Author: rinigus

importer/duplicates.sql

@@ -0,0 +1,7 @@
+select f.*, o.name from 
+(select o.name, parent, postal_code, t.name as type_name, count(*) as cnt from object_primary o
+join "type" t on t.id = o.type_id
+group by o.name, parent, postal_code, t.name
+order by cnt desc
+limit 25) f 
+join object_primary o on f.parent=o.id