From 78e057ad16bee40008bb3223588de980e402b776 Mon Sep 17 00:00:00 2001
From: larissalages <llo@cin.ufpe.br>
Date: Mon, 6 Sep 2021 12:28:52 -0300
Subject: [PATCH] sqlEventsDelta 1st solution

---
 Codility/SQL/SqlEventsDelta.sql | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 Codility/SQL/SqlEventsDelta.sql

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