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Participation is _____ if one entity occurrence does not require a corresponding entity occurrence in a particular relationship.
Q1: The hierarchical data model was developed in
Q22: _ are more detailed and specific than
Q27: Because _ e-commerce integrates business processes among
Q36: One of the advantages of a DDBMS
Q47: When you issue the DELETE FROM tablename
Q48: The _ approach to scheduling concurrent transactions
Q51: The end user must provide testing and
Q61: At the implementation level, the supertype and
Q89: Using Oracle _, you can write a
Q98: All primary key entries are unique, and