00314nam a22001217a 4500020001500000040000900015082001600024100001400040245004000054250002000094260003800114650004000152  a8178082314  cNUST  a005.74bDAT  aC.J. Date  aAn introduction to Database Systems  aSeventh Edition  aIndia:bPearson Education,c2002.  2An introduction to Database Systems