Answer:
A primary key is a special relational database table column (or combination of columns) designated to uniquely identify each table record. A primary key is used as a unique identifier to quickly parse data within the table. A table cannot have more than one primary key.
Primary Key.
Candidate Key.
Alternate Key.
Super Key.
Composite Key.
Foreign Key.
Unique Key.
In the relational model of databases, a primary key is a specific choice of a minimal set of attributes that uniquely specify a tuple in a relation. Informally, a primary key is "which attributes identify a record," and in simple cases constitute a single attribute: a unique ID.
Explanation:
<u>Paired programming:</u>
Paired programming is a new technique where one person gets one another to<em> write the code</em>. Here one will write the code and other will start verifying as the type.
So we might think it is waste to employ two person for same task but it is not so. There are many <em>benefits in incorporating this technique</em>. Let us see those benefits one by one.
- <em>Inter-personal skill gets improved
</em>
- <em>Lower amount of coding mistake
</em>
- <em>Learn from each other
</em>
- <em>Peer review enhance collaboration
</em>
Challenges expect to arise during pair-programming
-
Two heads are superior to one. On the off chance that the driver experiences a <em>hitch with the code</em>, there will be two of them who'll take care of the issue.
- Builds up your <em>staff's relational aptitudes</em>. Working together on a solitary venture encourages your group to welcome the estimation of <em>correspondence and collaboration. </em>
Overcome Method
The most ideal approach to move <em>toward blending</em> is to accomplice two software engineers and have them share a PC. The pair ought to have the option to choose how to part the work, and it is prudent that they should <em>switch jobs frequently.</em>
Answer:
Following code are:
int *temp; //declaration of variable
// perform swapping
temp = xp;
xp = yp;
yp = temp;
Explanation:
we declare an integer data type pointer variable "*temp" then perform swapping between them.
The variables "xp" and "yp" are already declared and these variables are performing swapping among three.
