SQL Select Sub Query Top Where Examples

1-) List the book with the most page number

Solution 1)

Select top 1 * from books 
       order by sayfaSayisi desc

Solution 2)

Select * from books 
     where sayafaSayisi=(Select max(sayfaSayisi) from books)

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Select - Top - Where - Order By - Sub Query - Aggragate -

2-)

Solution 1)

Select top 1 students.*,takendate 
from students,borrows 
where students.studentId = borrows.studentId 
order by borrows.takenDate desc

Solution 2)

Select top 1 students.*,takendate 
from students 
join borrows on students.studentId = borrows.studentId 
order by borrows.takenDate desc

Solution 3)

Select students.*,takendate 
from students 
join borrows on students.studentId = borrows.studentId 
where takenDate = (Select max(takenDate) from borrows)

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Select - Top - Join - Where - Order By - Sub Query - Çoklu Tablo -

3-) List the name and surname of the students and the number of books they read sorted by BookCount. Also list the students who have never read a book.

Solution 1)

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

Solution 2)

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

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Select - Top - Where - Having - Sub Query -