Database Fundamentals - ESP

Database Fundamentals : 1 File: N_drive:\jhu\class\1995\ 1994, 1995 Robert RobbinsDatabaseFundamentalsRobert J. RobbinsJohns Hopkins Fundamentals : 2 File: N_drive:\jhu\class\1995\ 1994, 1995 Robert RobbinsWhat is a Database ?General: A Database is any collection of related : A Database is a persistent, logically coherentcollection of inherently meaningful data, relevantto some aspects of the real portion of the real world relevant to the Database is sometimes referredto as the universe of discourse or as the Database miniworld. Whatever itis called, it must be well understood by the designers of the Fundamentals : 3 File: N_drive:\jhu\class\1995\ 1994, 1995 Robert RobbinsWhat is a Database Management System?

• allow data independence • provide non-procedural query language • perform automatic query optimization. File: N_drive: ... a single blue die. B = { 1,2,3,4,5,6 } LET R be the set of possible outcomes when rolling a single red die. R = { 1,2,3,4,5,6 }

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