diff --git a/schema.sql b/schema.sql
index 7a28105..d4b7d08 100644
--- a/schema.sql
+++ b/schema.sql
@@ -1,16 +1,16 @@
-CREATE TABLE IF NOT EXISTS registration_codes (
-  code VARCHAR(60) NOT NULL UNIQUE,
-  creationTime TIMESTAMP NOT NULL,
+CREATE TABLE IF NOT EXISTS registration_codes
+(
+  code           VARCHAR(60) NOT NULL UNIQUE,
+  creationTime   TIMESTAMP   NOT NULL,
   expirationTime TIMESTAMP,
-  usages INTEGER NOT NULL DEFAULT 0,
-  maxUsages Integer NOT NULL DEFAULT 1
+  usages         INTEGER     NOT NULL DEFAULT 0,
+  maxUsages      Integer     NOT NULL DEFAULT 1
 );
 
-CREATE TABLE IF NOT EXISTS registered_users (
-                                              registrationCode VARCHAR(60) NOT NULL UNIQUE,
-                                              username         VARCHAR(30) NOT NULL UNIQUE,
-                                              registeredTime   TIMESTAMP   NOT NULL
-);
-
-ALTER TABLE registered_users
-  ADD COLUMN registeredUserId VARCHAR(60);
\ No newline at end of file
+CREATE TABLE IF NOT EXISTS registered_users
+(
+  registrationCode VARCHAR(60) NOT NULL UNIQUE,
+  username         VARCHAR(30) NOT NULL UNIQUE,
+  registeredUserId VARCHAR(60) NOT NULL UNIQUE,
+  registeredTime   TIMESTAMP   NOT NULL
+);
\ No newline at end of file