SQL Alias Examples

1-) List all students by mergin their name and surname

Solution 1)

Select name + surname from students

Solution 2)

Select name + surname as ns from students

Solution 3)

Select name + ' ' + surname as ns from students

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2-) List the genders and student count of each gender

Solution 1)

Select gender,count(*) as StudentCount 
from students 
group by gender

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3-) List the numbers of boys and girls in each class.

Solution 1)

Select sinif,gender,count(*) as StudentCount 
from students 
group by gender,sinif

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4-) List only the number of female students in each class.

Solution 1)

Select sinif,gender,count(*) as StudentCount 
from students 
where gender = 'F'
group by gender,sinif

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5-) List the class names and number of students which the number of students more than 30.

Solution 1)

Select sinif,count(*) as StudentCount 
from students 
group by sinif
having count(*) >= 30

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6-) List the name and surname of the students and the number of books they read.

Solution 1)

Select name,surname,count(*) BookCount 
from students,borrows 
where students.studentId = borrows.studentId 
group by students.studentId,name,surname

Solution 2)

Select name,surname,count(*) BookCount 
from students
join borrows on students.studentId = borrows.studentId 
group by students.studentId,name,surname

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7-) List the name and surname of the students and the number of books they read sorted by BookCount.

Solution 1)

Select name,surname,count(*) BookCount 
from students
join borrows on students.studentId = borrows.studentId 
group by students.studentId,name,surname
order by BookCount desc

Solution 2)

Select name,surname,count(*) BookCount 
from students,borrows 
where students.studentId = borrows.studentId 
group by students.studentId,name,surname
order by BookCount desc

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8-) List the student count gruped by birthdate quarter

Solution 1)

Select Year(birthdate) as Year, datepart(qq,birthdate) as Quarter,count(*) as Count 
from students 
group by Year(birthdate),datepart(qq,birthdate)

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