Second Highest Salary

Viniciuscoding · web-flow · commit ae68b20c3f02 · 2022-08-21T13:05:43.000-04:00
diff --git a/Leetcode_176.sql b/Leetcode_176.sql
@@ -60,6 +60,7 @@ IFNULL((SELECT DISTINCT Salary
        LIMIT 1 OFFSET 1),
        NULL) AS SecondHighestSalary
 
+-- NOTE: DISTINCT clause in SQL considers unique values as NULL.
 SELECT (SELECT DISTINCT Salary
         FROM Employee
         ORDER BY Salary DESC
