Answer:
Basically it creates a unique identifier for each row in your table and that can help you link your table to other tables using primary key as link
Explanation:
"Primary key allows you to create a unique identifier for each row in your table. It is important because it helps you link your table to other tables (relationships) using primary key as links."
The program is an illustration of loops and conditional statements
<h3>
Loops</h3>
Loops are used to perform repetitive operations.
<h3>
Conditional statement</h3>
Conditional statements are used to make decisions
<h3>The python program</h3>
The program in Python, where comments are used to explain each line is as follows.
#The following is repeated 5 times; i.e. the rows
for i in range(5):
#The following is repeated 5 times; i.e. the columns
for j in range(5):
#For rows 2 and 5
if i == 1 or i== 3:
#For columns 1 and 5
if j == 0 or j == 4:
#This prints *
print('*',end='')
#For other columns
else:
#This prints an empty space
print('',end=' ')
#For other rows
else:
#This prints *
print('*',end='')
#This prints a new line
print()
Read more about loops at:
brainly.com/question/19344465
