1 files changed, 1 insertions, 1 deletions
diff --git a/tables.sql b/tables.sql
index 8948860..516db23 100644
--- a/tables.sql
+++ b/tables.sql
@@ -26,7 +26,7 @@ CREATE TABLE IF NOT EXISTS class(
 
 CREATE TABLE IF NOT EXISTS users(
     id INTEGER PRIMARY KEY AUTO_INCREMENT,
-    username VARCHAR(255) NOT NULL,
+    username VARCHAR(255) NOT NULL UNIQUE,
     name VARCHAR(255) NOT NULL,
     middlename VARCHAR(255) DEFAULT NULL,
     surname VARCHAR(255) NOT NULL,