00335nam a2200133 a 450000500170000002000150001708200160003210000230004824500370007125000130010826000390012130000210016070000200018120251203110938.0  a8131715353  a005.74bULL  aUllman, Jeffrey D.  aFirst course in database systems  a2nd Edn.  aNew DelhibPearson Educationc2002  a527p.c24 cm. PB  aWidom, Jennifer