diff --git a/officeHoursMysql.sql b/officeHoursMysql.sql
index 969add5..fd8ef8c 100644
--- a/officeHoursMysql.sql
+++ b/officeHoursMysql.sql
@@ -1,8 +1,13 @@
+DROP TABLE IF EXISTS `request`;
+DROP TABLE IF EXISTS `officeHour`;
+DROP TABLE IF EXISTS `room`;
+DROP TABLE IF EXISTS `tutor`;
+DROP TABLE IF EXISTS `course`;
+
 --
 -- Table structure for table `room`
 --
 
-DROP TABLE IF EXISTS `room`;
 CREATE TABLE `room` (
   `id` INTEGER PRIMARY KEY AUTO_INCREMENT,
   `name` text NOT NULL,
@@ -10,22 +15,28 @@ CREATE TABLE `room` (
 );
 
 --
--- Table structure for table `request`
+-- Table structure for table `tutor`
 --
 
-DROP TABLE IF EXISTS `request`;
-CREATE TABLE `request` (
+CREATE TABLE `tutor` (
   `id` INTEGER PRIMARY KEY AUTO_INCREMENT,
-  `officeHour` int DEFAULT NULL,
-  `action` int DEFAULT NULL,
-  `secret` text DEFAULT NULL
+  `name` tinytext DEFAULT NULL,
+  `email` tinytext DEFAULT NULL
+);
+
+--
+-- Table structure for table `course`
+--
+
+CREATE TABLE `course` (
+  `id` INTEGER PRIMARY KEY AUTO_INCREMENT,
+  `name` varchar(255) DEFAULT NULL
 );
 
 --
 -- Table structure for table `officeHour`
 --
 
-DROP TABLE IF EXISTS `officeHour`;
 CREATE TABLE `officeHour` (
   `id` INTEGER PRIMARY KEY AUTO_INCREMENT,
   `tutor` int DEFAULT NULL,
@@ -38,26 +49,20 @@ CREATE TABLE `officeHour` (
   `week` int DEFAULT NULL,
   `info` text DEFAULT NULL,
   `active` bool DEFAULT NULL,
-  `duration` int DEFAULT NULL
+  `duration` int DEFAULT NULL,
+  FOREIGN KEY (tutor) REFERENCES tutor(id),
+  FOREIGN KEY (room) REFERENCES room(id),
+  FOREIGN KEY (course) REFERENCES course(id)
 );
 
 --
--- Table structure for table `tutor`
+-- Table structure for table `request`
 --
 
-DROP TABLE IF EXISTS `tutor`;
-CREATE TABLE `tutor` (
+CREATE TABLE `request` (
   `id` INTEGER PRIMARY KEY AUTO_INCREMENT,
-  `name` tinytext DEFAULT NULL,
-  `email` tinytext DEFAULT NULL
-);
-
---
--- Table structure for table `course`
---
-
-DROP TABLE IF EXISTS `course`;
-CREATE TABLE `course` (
-  `id` INTEGER PRIMARY KEY AUTO_INCREMENT,
-  `name` varchar(255) DEFAULT NULL
+  `officeHour` int DEFAULT NULL,
+  `action` int DEFAULT NULL,
+  `secret` tinytext DEFAULT NULL,
+  FOREIGN KEY (officeHour) REFERENCES officeHour(id)
 );
diff --git a/officeHoursSQLite.sql b/officeHoursSQLite.sql
index ef71d6b..70f7109 100644
--- a/officeHoursSQLite.sql
+++ b/officeHoursSQLite.sql
@@ -18,7 +18,8 @@ CREATE TABLE `request` (
   `id` INTEGER PRIMARY KEY,
   `officeHour` int DEFAULT NULL,
   `action` int DEFAULT NULL,
-  `secret` text DEFAULT NULL
+  `secret` text DEFAULT NULL,
+  FOREIGN KEY (officeHour) REFERENCES officeHour(id)
 );
 
 --
@@ -38,7 +39,10 @@ CREATE TABLE `officeHour` (
   `week` int DEFAULT NULL,
   `info` text DEFAULT NULL,
   `active` bool DEFAULT NULL,
-  `duration` int DEFAULT NULL
+  `duration` int DEFAULT NULL,
+  FOREIGN KEY (tutor) REFERENCES tutor(id),
+  FOREIGN KEY (room) REFERENCES room(id),
+  FOREIGN KEY (course) REFERENCES course(id)
 );
 
 --