diff --git a/constraint_9.sql b/constraint_9.sql
index 4a7763b..f9f47bd 100644
--- a/constraint_9.sql
+++ b/constraint_9.sql
@@ -17,7 +17,7 @@ MODIFY (genre_name NOT NULL);
 ALTER TABLE tournaments
 MODIFY (tournament_name NOT NULL)
 MODIFY (tournament_start_date NOT NULL)
-MODIFY (tournament_end_date NOT NULL;
+MODIFY (tournament_end_date NOT NULL);
 
 ALTER TABLE sponsors
 MODIFY (sponsor_name NOT NULL)
@@ -194,7 +194,7 @@ CHECK (achievement_name = UPPER(achievement_name));
 
 ALTER TABLE rounds
 ADD CONSTRAINT ck_round_name
-CHECK (round_name = UPPER(round_name));]
+CHECK (round_name = UPPER(round_name));
 
 ALTER TABLE games
 ADD CONSTRAINT ck_game_name
diff --git a/create_9.sql b/create_9.sql
index dd3c5e2..acc113c 100644
--- a/create_9.sql
+++ b/create_9.sql
@@ -87,7 +87,7 @@ NOCYCLE;
 
 CREATE TABLE sponsors (
     sponsor_id NUMBER(4),
-    sponsor_name VARCHAR2(15) DEFAULT "anonymous",
+    sponsor_name VARCHAR2(15) DEFAULT 'anonymous',
     sponsor_type VARCHAR2(15),
     sponsor_start_date DATE DEFAULT SYSDATE,
     sponsor_end_date DATE
@@ -105,7 +105,7 @@ CREATE TABLE prizes (
     sponsor_id NUMBER(4),
     tournament_id NUMBER(4),
     prize_amount NUMBER(10),
-    achievement_name VARCHAR2(15) DEFAULT "winner"
+    achievement_name VARCHAR2(15) DEFAULT 'winner'
 );
 
 CREATE SEQUENCE seq_prizes