CREATE DATABASE Sudoku;
   CREATE TABLE Sudoku.Player;
   (
         UserName VARCHAR(10) NOT NULL,
         Password VARCHAR(18) NOT NULL,
         Email CHAR (20) NOT NULL,
         PRIMARY KEY(UserName),
         UNIQUE INDEX(UserName),
         FOREING KEY(Email) REFERENCES Sudoku.Player,
         FOREING KEY(Password) REFERENCES Sudoku.Player

   );
CREATE TABLE Sudoku.EndUser;
   (
         UserName VARCHAR(10) NOT NULL,
         Password VARCHAR(18) NOT NULL,
         Email CHAR (20) NOT NULL,
         PRIMARY KEY(UserName),
         UNIQUE INDEX(UserName),
         FOREING KEY(Email) REFERENCES Sudoku.EndUser,
         FOREING KEY(Password) REFERENCES Sudoku.EndUser

   );