This is called a key attribute!
There are different types of key attributes!
Primary key is the key that is actually chosen, for example a social security number. 
There is also a unique key, say our finger prints! they also uniquely identify humans, but usually we prefer to use social security number when we list people (a unique key could be a primary key if we chose so)
We could also identify people by their social security number and a name, but this is unnecessary, as social security number already gives a full identification. Such a reduntant key is called super key. 
        
             
        
        
        
 Right click the text you want to format, On the home tab click the line and paragraph spacing command . A drop down menu will appear. Move the mouse over the various options . The line spacing will change in the document. 
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Suppose that you have the following definitions:struct time Type struct tourTypen the variable destination of type your type are tourType input(){cout<<"Enter the city, distance and time in hr and min"<>destination.city name;
<h3>What is C++ statements?</h3>
Expression statements. These statements examine an expression for its aspect outcomes or for its go-back value. Null statements. These statements may be supplied in which a declaration is needed with the aid of using the C++ syntax however in which no motion is to be taken.
- #include
- #include
- the use of namespace std;
- struct timeType
- ;
- struct tourType
- ;
- tourType destination;
- tourType input(){
- cout<<"Enter the city, distance and time in hr and min"<>destination.cityName;
- cin>>destination.distance;
- cin>>destination.travelTime.hr;
- cin>>destination.travelTime.min;
- go back destination;
- }
- void display()cityName;
- d.distance = t->distance;
- d.travelTime.hr = t->travelTime.hr;
- d.travelTime.min = t->travelTime.min;">
- int main().
Read more about the variable :
brainly.com/question/2804470
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Features included in most DTP programs would be kerning, master pages, and WYSIWYG. S video editing isn't included in most programs for DTP