CREATE TABLE aUsers (
  userId INT NOT NULL IDENTITY,
  firstName VARCHAR(100) NOT NULL DEFAULT '',
  lastNAme VARCHAR(100) NOT NULL DEFAULT '',
  PRIMARY KEY  (userId)
);
CREATE TABLE aAccounts (
  accountId INT NOT NULL IDENTITY,
  accountName VARCHAR(100) NOT NULL DEFAULT '',
  SIZE INT NOT NULL DEFAULT 0,
  PRIMARY KEY  (accountId)
);
CREATE TABLE aAccess (
  accessLevel INT NOT NULL,
  accessName VARCHAR(100) NOT NULL DEFAULT '',
  PRIMARY KEY  (accessLevel)
);
CREATE TABLE aUserAccounts (
  accountId INT NOT NULL,
  userId INT NOT NULL,
  accessLevel INT NOT NULL DEFAULT 0
);
ALTER TABLE aUserAccounts ADD CONSTRAINT accountIdConstraint FOREIGN KEY (accountId) REFERENCES aAccounts (accountId);
ALTER TABLE aUserAccounts ADD CONSTRAINT userIdConstraint FOREIGN KEY (userId) REFERENCES aUsers (userId);
ALTER TABLE aUserAccounts ADD CONSTRAINT accessLevelConstraint FOREIGN KEY (accessLevel) REFERENCES aAccess (accessLevel);