Update README.md

Learner457 · web-flow · commit 7f39c35074f8 · 2025-05-21T18:48:58.000+05:30
diff --git a/README.md b/README.md
@@ -88,6 +88,8 @@ ON
     DATEDIFF(w1.recordDate, w2.recordDate) = 1
 WHERE 
     w1.temperature > w2.temperature;
+
+-- OR We can use lag() window function to get previous_temperature and record_date columns beside our table and filter it
 ```
 
 
