00311nam a2200121 a 450000500170000002000150001708200160003210000230004824500370007126000350010830000260014370000200016920251203110648.0  a8178083035  a005.74bULL  aUllman, Jeffrey D.  aFirst Course in Database Systems  aDelhibPearson Educationc1997  axiii,470p.c24 cm. PB  aWidom, Jennifer