CREATE TABLE Users (name VARCHAR(255) NOT NULL PRIMARY KEY, password VARCHAR(255) NOT NULL, isGuest BOOLEAN, isUser BOOLEAN, isAdministrator BOOLEAN, isEnabled BOOLEAN, CONSTRAINT checkFlags CHECK ((CASE WHEN isGuest THEN 1 ELSE 0 END)+(CASE WHEN isUser THEN 1 ELSE 0 END)+(CASE WHEN isAdministrator THEN 1 ELSE 0 END)=1));