right-join

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center . I've heard there are 3 types of joins I'm not sure of the exact names. Googling has turned up a variety of terms like : Cross join , left join , right join , inner join , outer join, self join.... Could anyone tell me how many joins exist in MySQL all in all. The joins are 1. Inner Join or Equi join 2. Self Join 2. Outer Join outer

Here are my models class Student: user = ForeignKey(User) department = IntegerField() semester = IntegerField() ... class Attendance: student = ForeignKey(Student) subject = ForeignKey(Subject) month = IntegerField() year = IntergerField() present = IntegerField() total = IntegerField() students = Student.objects.filter(semester=semester) How can I perform a right join between Student and Attendance models, so that I can get a queryset with all of the students and attendances` if exists for a student, else null? The documentation mentions left joins but not right joins. You can use such query:

I am confused with finding left outer join and right outer join properly with Oracle join (+) sign. Check this vs this . I feel both contradict. What I understand is, First link says if the (+) sign is in right hand side, it will be Right Outer Join. Whereas with second link, my understanding is totally wrong. Please clarify how to find the right and left outer join properly with an example? Please clarify how to find the right and left outer join properly with an example I will give a try to show the difference between Oracle outer join syntax and the ANSI/ISO Syntax . LEFT OUTER JOIN -

This question already has an answer here: LEFT JOIN vs. LEFT OUTER JOIN in SQL Server 12 answers What is the difference in results between: RIGHT JOIN and RIGHT OUTER JOIN LEFT JOIN and LEFT OUTER JOIN ? Can you please explain it through some examples? Pranay Rana There is no difference between RIGHT JOIN and RIGHT OUTER JOIN . Both are the same. That is, LEFT JOIN and LEFT OUTER JOIN both are the same. Visual Representation of SQL Joins Here's a very nice Visual Explanation of joins generally by our very own Jeff Atwood. A right outer join is the same as a right join, and left join and left

Wikipedia states: "In practice, explicit right outer joins are rarely used, since they can always be replaced with left outer joins and provide no additional functionality." Can anyone provide a situation where they have preferred to use the RIGHT notation, and why? I can't think of a reason to ever use it. To me, it wouldn't ever make things more clear. Edit: I'm an Oracle veteran making the New Year's Resolution to wean myself from the (+) syntax. I want to do it right The only reason I can think of to use RIGHT OUTER JOIN is to try to make your SQL more self-documenting. You might possibly

Is it possible to write join query without ON statement? and how do these joins differ LEFT JOIN, RIGHT JOIN works. MySQL documentation covers this topic. Here is a synopsis. When using join or inner join , the on condition is optional. This is different from the ANSI standard and different from almost any other database. The effect is a cross join . Similarly, you can use an on clause with cross join , which also differs from standard SQL. A cross join creates a Cartesian product -- that is, every possible combination of 1 row from the first table and 1 row from the second. The cross join for