add view for measurement

schema/create-schema.sql

@@ -61,3 +61,20 @@ grant select on variable_t to preprocessor;
 grant insert on measurement_t to preprocessor;
 grant select on measurement_t to grafana;
 
+
+create view measurement_v as
+  select m.time as time, 
+         m.value as value, 
+	 v.quantity as quantity, 
+	 v.unit as unit, 
+	 v.label as variable, 
+	 a.label as application 
+    from measurement_t m, 
+         application_t a, 
+	 variable_t v 
+    where m.variable = v.id and 
+          v.app = a.id;
+
+grant select on measurement_v to grafana;
+
+