________ is a set of rules that Access uses to ensure that the data between related tables is valid.
a. A subdatasheet
b. A join line
c. Referential integrity
d. A foreign key
Answer: c. Referential integrity
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What is the difference between the iterators defined here.
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vector
SQL uses ________ to extract records from a database by using English-like expressions that have variables and operations
A) foreign keys B) primary keys C) relational algebra D) Boolean algebra
Answer the following statements true (T) or false (F)
1. Nonprintable characters may be written to or read from a stream. 2. A stream has a fixed size 3. Assuming ch is declared as a character variable, cin.get (ch) skips any leading white space when reading into ch. 4. When reading from a data file, the external file name and the internal file name must be the same. 5. External data files saved on a secondary storage device are considered permanent files.
Which of these characteristics might be included in a class called “BankAcct?”
A. Account Number B. Credit card C. Shoe Size D. ATM location