Answer and Explanation:
For Student Database:
The problems which are faced by students:
1.Students can not able to login in the website.
2.Students are not able to write exam because their details were missed.
3.students can not able to update their details suppose students must fill their date of birth in the website. But they cant because of database failure.
4.students are not able to apply leaves.
5.Students may not get attendance (if in case of online attendance is there).
6.All the services are unavailable for students.
The problems which faced by instructors:
1.can not give permission to students for outing or leave.
2.can not give attendance.
3.can not show latest updates in the college.
4.Instructors may not found students exam paper(online submission) because of database failure.
A composite primary key applies to more than one field. <span>A table can have only one primary key, which may consist of single or multiple fields.</span>
A composite primary key is selected from Design view. <span>In Design </span>view<span>, you can use the </span>Primary Key<span> button to assign or remove the </span>primary key<span> designation for the </span>selected<span> field or fields.</span>
Answer:
Explanation:
To create tables in Access using “Design View,” click the “Create” tab in the Ribbon. Then click the “Table Design” button in the “Tables” group. A new table then appears in the tabbed documents area. Type the name of a field into the “Field Name” column.
Are you going to fix any of the thing that it needs
Answer:
Let f be a function
a) f(n) = n²
b) f(n) = n/2
c) f(n) = 0
Explanation:
a) f(n) = n²
This function is one-to-one function because the square of two different or distinct natural numbers cannot be equal.
Let a and b are two elements both belong to N i.e. a ∈ N and b ∈ N. Then:
f(a) = f(b) ⇒ a² = b² ⇒ a = b
The function f(n)= n² is not an onto function because not every natural number is a square of a natural number. This means that there is no other natural number that can be squared to result in that natural number. For example 2 is a natural numbers but not a perfect square and also 24 is a natural number but not a perfect square.
b) f(n) = n/2
The above function example is an onto function because every natural number, let’s say n is a natural number that belongs to N, is the image of 2n. For example:
f(2n) = [2n/2] = n
The above function is not one-to-one function because there are certain different natural numbers that have the same value or image. For example:
When the value of n=1, then
n/2 = [1/2] = [0.5] = 1
When the value of n=2 then
n/2 = [2/2] = [1] = 1
c) f(n) = 0
The above function is neither one-to-one nor onto. In order to depict that a function is not one-to-one there should be two elements in N having same image and the above example is not one to one because every integer has the same image. The above function example is also not an onto function because every positive integer is not an image of any natural number.