end of day 3 week 1

week 1/day3/exo3.sql

@@ -0,0 +1,10 @@
+-- exo 3
+
+SELECT username,
+       CASE
+           WHEN length(username) <= 20
+                AND username ~ '^[A-Za-z]+$'
+           THEN 'Accepted'
+           ELSE 'Refused'
+       END AS status
+FROM users;