Solution:
Database integrity ensures that each row is uniquely identified by the primary key, which means that a proper search for an existing tuple (row) will always be successful.
Thus the required answer is D
The process that involves writing down your main ideas, subpoints, and supporting material, then using geometric shapes is mapping.
This includes uses of arrows to indicate logical relationships.
<h3>What is mapping?</h3>
mapping can be regarded as the prescribed way of assigning an object to each object in one set a particular object.
Learn more about mapping at:
brainly.com/question/25168859
Answer:
The answer is "except IOError:"
Explanation:
It is part of the exception handling, that stands for input/ output operation fails, this exception aeries when we attempting to access an anti-existent file, in the program so, it will give the program related errors.
- This type of error is handled in the try block, it also allows you to prepare the deal with the exceptional block.
- It also helps you to hide the bugs by using code, if you handle an unexpected error.
Answer:
Option (4) is the correct answer.
Explanation:
In Java programming language ,array collection starts from 0 index location and ends in a size-1 index location. So to access the last elements the user needs to use a[Size-1] statement. so to modify the value of the last location of the array the user needs to use "a[size-1]= element;".
But when the user wants to add some new value to the end of the array list collection then he needs to use the statement--
a.add(element); //where add is a function, element is a value and a is a array list object.
Another option is invalid because--
- Option 1 is not the correct because "a[3]=element;" modify the value of the 3rd element of the array.
- Option 2 gives a compile-time error because add functions bracts are not closed.
- Option 3 gives the error because a[4] gives the location of the 5th element of the array but the above question says that a is defined with 4 elements.
Answer:
wireless information appliances and services affect the business use of the internet and the web in a positive way. Wireless information appliances and services affect the business use of the web and internet by allowing internet pretty much anywhere. Now days devices like cell phones can access almost everything a regular computer can access. The use of wireless information allows businesses to stay in constant contact with customers, employees, and suppliers.
