text: BEGIN;
  
  ALTER TABLE Organisations ADD CONSTRAINT OrganisationsPKey PRIMARY KEY (OrganisationID);
  
  ALTER TABLE VideoGames ADD CONSTRAINT VideoGamesPKey PRIMARY KEY (GameID);
  
  ALTER TABLE Players ADD CONSTRAINT PlayersPKey PRIMARY KEY (PlayerID);
  
  ALTER TABLE ESportEvents ADD CONSTRAINT EventsPKey PRIMARY KEY (EventId);
  
  COMMIT;
  