diff --git a/sql/s15/q12.sql b/sql/s15/q12.sql
new file mode 100644
index 0000000000000000000000000000000000000000..835b2674cb8f6fc35c5c298a83cb4025306b6da5
--- /dev/null
+++ b/sql/s15/q12.sql
@@ -0,0 +1,3 @@
+select count(*) FROM Object o, ForcedSource f 
+ WHERE o.deepSourceId=f.deepSourceId 
+   AND f.psfFlux BETWEEN 0.13 AND 0.14;