Keys are data items in a record used to identify the record. What are key types?

What will be an ideal response?

A. Primary key, unique for the record.
B. Secondary key, a key which may not be unique.
C. Concatenated key, or composite key, a combination of two or more data items for the key.
D. Foreign key, a data item in one record that is the key of another record.

Computer Science & Information Technology

You might also like to view...

Here is some code. There are only two outputs, one a message from the unnamed namespace the other a message from the Savitch namespace. Tell which line generates which message.

``` #include using namespace std;namespace { void message(); } namespace Savitch { void message(); } int main() { { message(); //a) Savitch::message(); //b) using Savitch::message; message(); //c) } message(); //d) return 0; } namespace Savitch {void message() {cout << "Message from NS Savitch\n";} }namespace {void message(){ cout <<"Message from unnamed NS\n"; ``` 1) List the letters of the lines that give the message from the unnamed namespace: ____________________ 2) List the letters of the lines that give the message from the Savitch namespace: ____________________ What will be an ideal response?

View
Computer Science & Information Technology

The SQL commands that you enter in the Query Area are identical to those that are used in the MySQL Command Line Client window.

Answer the following statement true (T) or false (F)

View
Computer Science & Information Technology