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An identifier serves the same role for a table that a key does for an entity.
Q1: The problem of misspelled data entries is
Q6: Briefly describe the various tasks of the
Q15: In IDEF1X,extended E-R model weak,but non-ID-dependent relationships
Q25: When increasing cardinalities from 1:N to N:M,we
Q31: In a correlated subquery,the DBMS must run
Q40: An online drugstore such as Drugstore.com is
Q61: The SQL keyword GROUP BY instructs the
Q64: Every time we break up a relation
Q70: A data model is a plan for
Q82: A surrogate key should be considered when