Answer:
The answer is letter C. The letter C is the true statement.
Explanation:
The true statement is The point-of-sale terminal cannot connect directly to the Internet.
Ask your mobile operator
2.go to hrs service
3. Turn on and turn off
Answer:
b. foreign key
Explanation:
In the database world, a foreign key is a field on one table and a primary key for another table. The purpose of a foreign key is to provide linkages between two or more tables. Given two tables A and B, and making A the point of reference, a primary key is a field that is unique in A while a foreign key is unique in B.
On another hand, a composite primary key is a combination of two or more fields/columns on database table that can be used to uniquely identify each row in the table.
In the database lingua, what we have is a unique key not a distinct key, though the two words are similar in meaning.
A duplicate key is used when an information may be repeatedly entered on a table.
So the correct option is a foreign key.
The answer is : Click the Insert Formula icon on the Formulas tab ribbon. The formula bar is located just below the Ribbon. It displays the contents of the active cell. It can also be
used for entering or editing data and formulas. Found on the left of the formula bar, the insert icon dialog box helps the user identify and implement
functions, a type of formula that performs specialized and group calculations.
