exchange seat

Author: letsdeepchat

SUBQUERIES/626. Exchange Seats.sql

@@ -0,0 +1,13 @@
+# Write your MySQL query statement below
+SELECT 
+    CASE
+        WHEN id = (SELECT MAX(id) FROM seat) AND id % 2 = 1
+            THEN id
+        WHEN id % 2 = 1
+            THEN id + 1
+        WHEN id % 2 = 0
+            THEN id - 1
+    END as id, student
+FROM seat
+ORDER BY id;
+