RIGHT JOIN: RIGHT JOIN is similar to LEFT JOIN. This join returns all the rows of the table on the right side of the join and matching rows for the table on the left side of join. The rows for which there is no matching row on left side, the result-set will contain null. RIGHT JOIN is also known as RIGHT OUTER JOIN.
What is the function of a right outer join?
Right Outer Join returns all the rows from the table on the right and columns of the table on the left is null padded. Right Outer Join retrieves all the rows from both the tables that satisfy the join condition along with the unmatched rows of the right table. Syntax: SELECT [column1, column2, ….]
What does a right join do in SQL?
The SQL RIGHT JOIN returns all rows from the right table, even if there are no matches in the left table. … This means that a right join returns all the values from the right table, plus matched values from the left table or NULL in case of no matching join predicate.
What is right outer join in SQL Server?
What is Right Outer Join? The Right Outer Join is used to retrieve all the matching records from both the tables as well as all the non-matching records from the right-hand side table. In that case, the un-matching data will take the null value. The following diagram shows Right Outer Join in SQL Server.
What is difference between left join and right join?
The main difference between these joins is the inclusion of non-matched rows. The LEFT JOIN includes all records from the left side and matched rows from the right table, whereas RIGHT JOIN returns all rows from the right side and unmatched rows from the left table.
How is full join different from left and right join?
LEFT JOIN: returns all rows from the left table, even if there are no matches in the right table. RIGHT JOIN: returns all rows from the right table, even if there are no matches in the left table. FULL JOIN: It combines the results of both left and right outer joins.
What is the difference between right join and right outer join?
4 Answers. There is no difference between RIGHT JOIN and RIGHT OUTER JOIN . Both are the same. That means that LEFT JOIN and LEFT OUTER JOIN are the same.
What is equi join?
An equi join is a type of join that combines tables based on matching values in specified columns. … The column names do not need to be the same. The resultant table contains repeated columns. It is possible to perform an equi join on more than two tables.
How do you do a right join?
The RIGHT JOIN keyword returns all records from the right table (table2), and the matching records from the left table (table1). The result is 0 records from the left side, if there is no match.
What is difference between inner join and outer join?
The major difference between inner and outer joins is that inner joins result in the intersection of two tables, whereas outer joins result in the union of two tables.
Which join is faster in SQL?
Well, in general INNER JOIN will be faster because it only returns the rows matched in all joined tables based on the joined column. But LEFT JOIN will return all rows from a table specified LEFT and all matching rows from a table specified RIGHT.
Which join is best in SQL?
Outer joins can offer superior performance when used in views. Say you have a query that involves a view, and that view is comprised of 10 tables joined together. Say your query only happens to use columns from 3 out of those 10 tables.
Which join should I use?
Generally, we use INNER JOIN when we want to select only rows that match an ON condition. … We use a LEFT JOIN when we want every row from the first table, regardless of whether there is a matching row from the second table. This is similar to saying, “Return all the data from the first table no matter what.