Minor changes made

Author: GeoSegun

sql-queries-10/lateral-joins-vs-subqueries/example-usage-lateral-join.sql

@@ -18,9 +18,9 @@ LEFT JOIN LATERAL (
     ORDER BY 
         te.year DESC, 
         CASE te.semester
-            WHEN 'Fall' THEN 3
-            WHEN 'Summer' THEN 2
-            WHEN 'Spring' THEN 1
+            WHEN 'FALL' THEN 3
+            WHEN 'SUMMER' THEN 2
+            WHEN 'SPRING' THEN 1
             ELSE 0
         END DESC
     LIMIT 1

sql-queries-10/lateral-joins-vs-subqueries/example-usage-subqueries.sql

@@ -7,9 +7,9 @@ SELECT
         WHERE te.faculty_id = f.id
         ORDER BY te.year DESC, 
             CASE te.semester
-                WHEN 'Fall' THEN 3
-                WHEN 'Summer' THEN 2
-                WHEN 'Spring' THEN 1
+                WHEN 'FALL' THEN 3
+                WHEN 'SUMMER' THEN 2
+                WHEN 'SPRING' THEN 1
                 ELSE 0
             END DESC
         LIMIT 1