diff --git a/ERD-Dechboard.mwb b/ERD-Dechboard.mwb
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diff --git a/mysql-commands/README.txt b/mysql-commands/README.txt
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+This are the different tables what we implemented for the first sprint.
+
+
+Important: 
+	-NO CONSTRAINTS, TRIGGER and other DETAILS are not  implemented yet .
+	-Considering the Data Proctection some data may be deleted or changed. 
+	-Professor Jung has suggested to use MongoDB for the project.
+
diff --git a/mysql-commands/administrator.sql b/mysql-commands/administrator.sql
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+++ b/mysql-commands/administrator.sql
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+CREATE TABLE IF NOT EXISTS `administrator` (
+  `adminID` bigint NOT NULL,
+  `password` varchar(32) NOT NULL,
+  `announcementNumber` bigint NOT NULL,
+  PRIMARY KEY (`adminID`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf32; 
+
+ALTER TABLE `administrator`
+ADD CONSTRAINT `administrator_ibfk_1` 
+FOREIGN KEY (`adminID`) 
+REFERENCES `announcement` (`posterID`) 
+ON DELETE RESTRICT 
+ON UPDATE RESTRICT;
\ No newline at end of file
diff --git a/mysql-commands/announcement.sql b/mysql-commands/announcement.sql
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+++ b/mysql-commands/announcement.sql
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+CREATE TABLE IF NOT EXISTS `announcement` (
+  `announcementID` BIGINT NOT NULL AUTO_INCREMENT,
+  `createTime` 	TIMESTAMP NOT NULL,
+  `updateAt`TIMESTAMP NULL DEFAULT NULL,
+  `title` VARCHAR(50), 
+  `content` varchar(140) NOT NULL,
+  `contentType`varchar(50), -- If special board, English, Algebra  -- 
+  `posterID` bigint NOT NULL,
+  `filetype` VARCHAR(16),
+  `fileURL` TEXT, 
+  PRIMARY KEY (`announcementID`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; -- Constrains fehlen -- 
+
diff --git a/mysql-commands/comment.sql b/mysql-commands/comment.sql
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+++ b/mysql-commands/comment.sql
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+CREATE TABLE IF NOT EXISTS `comment` (   -- Comments on generated Posts --
+  `commentID` BIGINT NOT NULL AUTO_INCREMENT, -- PK --
+  `publisherID` BIGINT NOT NULL,  -- ID from the commetator --
+  `postId` BIGINT NOT NULL,  -- ID from the commented post --
+  `content` varchar(120) NOT NULL,  -- some text --
+  `createTime` timestamp NOT NULL,
+  `updatedAt`TIMESTAMP NULL DEFAULT NULL,
+  primary key (`commentId`),
+  KEY `publisherID` (`publisherID`),
+  KEY `commentReceiveID` (`commentReceiveID`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; -- Constrains fehlen -- 
+
+ALTER TABLE `comment` 				-- publisher Id as FK for post -- 
+ADD CONSTRAINT `fk_user_source`
+FOREIGN KEY (`publisherId`)
+REFERENCES `user` (`userId`)
+ON DELETE NO ACTION
+ON UPDATE NO ACTION;
+
+ALTER TABLE `comment` 				-- commentReceiveId as FK for post -- 
+ADD CONSTRAINT `fk_post_source`
+FOREIGN KEY (`commentReceiveId`)
+REFERENCES `post` (`postId`)
+ON DELETE NO ACTION
+ON UPDATE NO ACTION;
+
diff --git a/mysql-commands/friends.sql b/mysql-commands/friends.sql
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+++ b/mysql-commands/friends.sql
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+CREATE TABLE `friends` (
+  `friendshipId` BIGINT NOT NULL AUTO_INCREMENT,
+  `sourceId` BIGINT NOT NULL,
+  `targetId` BIGINT NOT NULL,
+  `type` TINYINT, -- Mother, Neighboor, Student,etc... -- 
+  `status` TINYINT NOT NULL, -- requested, refuse, ignored, ... -- 
+  `createdAt` TIMESTAMP NOT NULL,
+  `notes` TEXT NULL DEFAULT NULL,
+  PRIMARY KEY (`friendshipId`),
+
+CONSTRAINT `fk_friend_source` -- SourceID as FK for user table -- 
+FOREIGN KEY (`sourceId`)
+REFERENCES `user` (`userId`)
+ON DELETE NO ACTION
+ON UPDATE NO ACTION);
+    
+ALTER TABLE `friends`
+ADD UNIQUE `uq_friend`(`sourceId`, `targetId`); -- making friendship between 2 persons unique -- 
+
+ALTER TABLE `friends` 
+ADD CONSTRAINT `fk_friend_target`   -- TargetID as FK for user table -- 
+FOREIGN KEY (`targetId`)
+REFERENCES `user` (`userId`)
+ON DELETE NO ACTION
+ON UPDATE NO ACTION;
+
+ 
\ No newline at end of file
diff --git a/mysql-commands/messages.sql b/mysql-commands/messages.sql
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+++ b/mysql-commands/messages.sql
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+CREATE TABLE `messages` (   -- Chat messages -- 
+  `messageId` BIGINT NOT NULL AUTO_INCREMENT,
+  `sourceId` BIGINT NOT NULL,  -- Sender Id --
+  `targetId` BIGINT NOT NULL,   -- receiver Id--
+  `content` TEXT,  -- message text -- 
+  `createdAt` TIMESTAMP NOT NULL,  -- for tracking upload date -- 
+  PRIMARY KEY (`messageId`),
+  CONSTRAINT `fk_umesssage_source`   -- sourceId (sender) as FK for user table --
+    FOREIGN KEY (`sourceId`)
+    REFERENCES `user` (`userId`)
+    ON DELETE NO ACTION
+    ON UPDATE NO ACTION);
+
+ALTER TABLE `messages`   			-- TargetId (receiver) as FK for user table --
+ADD CONSTRAINT `fk_umessage_target`
+  FOREIGN KEY (`targetId`)
+  REFERENCES `user` (`userId`)
+  ON DELETE NO ACTION
+  ON UPDATE NO ACTION;
\ No newline at end of file
diff --git a/mysql-commands/post.sql b/mysql-commands/post.sql
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+++ b/mysql-commands/post.sql
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+CREATE TABLE IF NOT EXISTS `post` (
+  `postId` BIGINT NOT NULL AUTO_INCREMENT,
+  `publisherId` BIGINT NOT NULL,
+  `title` VARCHAR(50), 
+  `status` TINYINT NOT NULL, -- private = 1 , public = 2 or important = 3 --
+  `content` VARCHAR(140) NOT NULL,
+  `boardType`VARCHAR(50), -- If special board, English, Algebra  -- 
+  `createTime` TIMESTAMP NOT NULL,
+  `updateAt`TIMESTAMP NULL DEFAULT NULL , -- this contains the last updated date-- 
+  `commentCounter` BIGINT NOT NULL, -- counter for accumulated number of  comments -- 
+  `upvotes` BIGINT,  
+  `downvotes` BIGINT, 
+  `filetype` VARCHAR(16), 
+  `fileURL` TEXT, 
+  PRIMARY KEY (`postId`),
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; 
+
+ALTER TABLE `post`
+ADD CONSTRAINT `fk_upost_user`    -- publisherID as FK for user table -- 
+FOREIGN KEY (`publisherId`)				-- Delete the post without deleting the user -- 
+REFERENCES `user` (`userId`)
+ON DELETE NO ACTION
+ON UPDATE NO ACTION;
+
diff --git a/mysql-commands/user.sql b/mysql-commands/user.sql
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+++ b/mysql-commands/user.sql
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+ CREATE TABLE IF NOT EXISTS `dechboard`.`user` (
+  `userId` BIGINT NOT NULL AUTO_INCREMENT,
+  `firstName` VARCHAR(50) NOT NULL,
+  `lastName` VARCHAR(50) NOT NULL,
+  `userName` VARCHAR(50) NULL DEFAULT NULL,
+  `phoneNumber` VARCHAR(15) NULL,
+  `email` VARCHAR(50) NOT NULL,
+  `profilePicture` BLOB,  
+  `passwordHash` VARCHAR(32) NOT NULL, -- only storing the hash -- 
+  `intro` VARCHAR(50) NULL DEFAULT NULL, -- short Text for introduce yourself -- 
+  `gender`TINYINT NOT NULL,  -- 1 = man, 2 = women , 3 = divers -- 
+  `birthday` DATETIME NOT NULL,
+  `status` VARCHAR (50) NOT NULL, -- this specifies Student or Teacher -- 
+  
+  PRIMARY KEY (`userId`),
+  UNIQUE INDEX `uq_userName` (`userName` ASC),
+  UNIQUE INDEX `uq_phoneNumber` (`phoneNumber` ASC),
+  UNIQUE INDEX `uq_email` (`email` ASC) )
+  ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";
+SET time_zone = "+00:00";
+-- Constrains fehlen -- 
\ No newline at end of file