A graph is ____________________ if the number of vertices is zero.
Fill in the blank(s) with the appropriate word(s).
empty
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MC The______ method may be defined to implement a test for membership (using in).
a) __contains__. b) in. c) __in__. d) None of the above.
What are the semantics of the Comparable interface?
What will be an ideal response?
Consider the ER diagram shown in Figure 7.21 for part of a BANK database. Each bank can have multiple branches, and each branch can have multiple accounts and loans.
(a) List the strong (nonweak) entity types in the ER diagram.
(b) Is there a weak entity type? If so, give its name, its partial key, and its identifying relationship.
(c) What constraints do the partial key and the identifying relationship of the weak entity type specify in this diagram?
(d) List the names of all relationship types, and specify the (min,max) constraint on each participation of an entity type in a relationship type. Justify your choices.
(e) List concisely the user requirements that led to this ER schema design.
(f) Suppose that every customer must have at least one account but is restricted
to at most two loans at a time, and that a bank branch cannot have more than
1000 loans. How does this show up on the (min,max) constraints?
In terms of creating a calculated field in a query, define the term expression and give two examples of expression elements
What will be an ideal response?