diff --git a/sql/import-from-influx.sql b/sql/import-from-influx.sql
index 4583b6d..de39459 100644
--- a/sql/import-from-influx.sql
+++ b/sql/import-from-influx.sql
@@ -1,3 +1,10 @@
 INSERT INTO public."glucose-import"  
-                              (SELECT nextval('glucose-import_id_seq'), "glucose"."deviceSerialNumber", "glucose"."deviceType", units, value, time FROM influx.glucose);
-
+  (SELECT nextval('glucose-import_id_seq'), 
+          "glucose"."deviceSerialNumber",
+		  "glucose"."deviceType", 
+		  "glucose".units, 
+		  "glucose".value, 
+		  "glucose".time 
+	FROM influx.glucose 
+	WHERE "glucose".time >= (SELECT max(time) FROM public."glucose-import")
+	);