diff --git a/sql/s15/q09.sql b/sql/s15/q09.sql
new file mode 100644
index 0000000000000000000000000000000000000000..30e2df2fa32f5f23d184c44728dc5479ecbe6a35
--- /dev/null
+++ b/sql/s15/q09.sql
@@ -0,0 +1 @@
+select count(*) from Source where flux_sinc between 2 and 3;
