added constraints to create

create_9.sql

@@ -1,39 +1,35 @@
 CREATE TABLE players (
     player_id NUMBER(4),
-    player_name VARCHAR2(15),
-    contact_email VARCHAR2(25),
-    contact_number CHAR(13)
-<<<<<<< HEAD
+    player_name VARCHAR2(15) NOT NULL,
+    contact_email VARCHAR2(25) UNIQUE,
+    contact_number CHAR(13) UNIQUE
 );
-=======
-);
->>>>>>> 3d5803ccf80e7a46ce8acc07ecaa3a5205add4a6
 
 CREATE TABLE teams (
     team_id NUMBER(4),
-    team_name VARCHAR2(15),
-    date_established DATE
+    team_name VARCHAR2(15) NOT NULL,
+    date_established DATE DEFAULT SYSDATE
 );
 
 CREATE TABLE team_players (
     team_player_id NUMBER(8),
     player_id NUMBER(4),
     team_id NUMBER(4),
-    date_joined DATE
+    date_joined DATE NOT NULL SYSDATE
 );
 
 CREATE TABLE categories (
     genre_id NUMBER(4),
-    genre_name VARCHAR2(15),
+    genre_name VARCHAR2(15) NOT NULL UNIQUE DEFAULT SYSDATE,
     genre_description VARCHAR2(200),
     genre_accronym CHAR(5)
 );
 
 CREATE TABLE tournaments (
     tournament_id NUMBER(4),
-    tournament_name VARCHAR2(15),
-    tournament_start_date DATE,
-    tournament_end_date DATE,
+    tournament_name VARCHAR2(15) NOT NULL,
+    tournament_start_date DATE NOT NULL DEFAULT SYSDATE,
+    tournament_end_date DATE NOT NULL,
     tournament_city VARCHAR2(15),
     tournament_country VARCHAR2(15),
     tournament_arena VARCHAR2(15),
@@ -49,9 +45,9 @@ CREATE TABLE tournament_participants (
 
 CREATE TABLE sponsors (
     sponsor_id NUMBER(4),
-    sponsor_name VARCHAR2(15),
+    sponsor_name VARCHAR2(15) NOT NULL DEFAULT "anonymous",
     sponsor_type VARCHAR2(15),
-    sponsor_start_date DATE,
+    sponsor_start_date DATE NOT NULL DEFAULT SYSDATE,
     sponsor_end_date DATE
 );
 
@@ -59,30 +55,30 @@ CREATE TABLE prizes (
     prize_id NUMBER(8),
     sponsor_id NUMBER(4),
     tournament_id NUMBER(4),
-    prize_amount NUMBER(10),
-    achievement_name VARCHAR2(15)
+    prize_amount NUMBER(10) NOT NULL,
+    achievement_name VARCHAR2(15) NOT NULL DEFAULT "winner"
 );
 
 CREATE TABLE rounds (
     round_id NUMBER(8),
-    round_name VARCHAR2(25),
+    round_name VARCHAR2(25) NOT NULL,
     round_description VARCHAR2(200)
 );
 
 CREATE TABLE games (
     game_id NUMBER(8),
-    game_name VARCHAR2(15),
+    game_name VARCHAR2(15) NOT NULL,
     round_id NUMBER(8)
 );
 
 CREATE TABLE statistics (
     game_result_id NUMBER(8),
     game_id NUMBER(4),
-    game_duration NUMBER(8),
-    game_WLD CHAR(4),
-    game_kills NUMBER(5),
-    game_deaths NUMBER(5),
-    game_assists NUMBER(5)
+    game_duration NUMBER(8) NOT NULL,
+    game_WLD CHAR(4) NOT NULL,
+    game_kills NUMBER(5) NOT NULL,
+    game_deaths NUMBER(5) NOT NULL,
+    game_assists NUMBER(5) NOT NULL
 );
 
 CREATE TABLE game_participants (