A composite primary key<span> is a set of several primary </span>keys<span> that, together, uniquely identifies each record.</span>
Primary keys are used as identifiers of composite entities. In this case each primary key combination is allowed only once in the *:* relationship.
Other case where primary keys are used is as identifiers of weak entities, where the weak entity has a strong identifying relationship with the parent entity.
Answer:
PDA is the correct answer to the following answer.
Explanation:
PDA refers for Programmable Digital Assistant, which is a portable organizer that stores contact data, manages calendars, communicates via e-mail, and manages documents and spreadsheets, typically in conjunction with the user's personal computer. Olivia needs a PDA in order to communicate more effectively.
ICloud is one of the many different tech options.
Hope I helped,
Ms. Weasley
Answer:
Option c is correct.
Example :
public class Subject
{
public static void main(String [] args)
{
int ar[]={5,4,6,7,8};
System.out.println("the number of array elements are: ",ar.length);
}
}
Explanation:
The above program is created in java language in which Subject is a class name.Inside Subject class , there is main method.
Inside the main method, there is An array named 'ar' which data type is an integer and we have assigned the value to this array.
in the next line, we are printing the total no. of the element in the array with the length function which displays the length of an array or variable.
Answer:
TRUE
Explanation:
MAC - multi-agency coordination is a group of executives or administrators that have the authority to control agency funds or resources while EOCs - Emergency operation centers are in charge of carrying out of emergency tasks that requires preparedness or disasters, they ensure that work continues even in case of emergency and disasters.
