SQL features
    transactions
    timing
     performance analysis
    optimization
    security (roles, privileges)
    XMLquery
    PL/SQL

other technologies:
    JDO
    VB.net
    TOAD

Other DB:
    mySQL
    Borland tools
    DB2
    Google DB services
    msSQLserver

Applications
    Art DB
    review of Kroenke book

unknown:  (1)