diff --git a/Codility/SQL/SqlEventsDelta.sql b/Codility/SQL/SqlEventsDelta.sql
new file mode 100644
index 0000000..75c8da5
--- /dev/null
+++ b/Codility/SQL/SqlEventsDelta.sql
@@ -0,0 +1,17 @@
+-- write your code in PostgreSQL 9.4
+SELECT e1.event_type, (e1.value - e2.value) as value
+FROM events e1
+INNER JOIN events e2 ON e1.event_type = e2.event_type
+AND e1.time = (
+    SELECT temp1.time 
+    from events temp1 
+    WHERE temp1.event_type = e1.event_type
+    ORDER BY temp1.time DESC
+    LIMIT 1)
+AND e2.time = (
+    SELECT temp2.time
+    FROM events temp2
+    WHERE temp2.event_type = e2.event_type
+    ORDER BY temp2.time
+    DESC LIMIT 1 OFFSET 1
+);
\ No newline at end of file