MS SQL Server Interview Question:

How To Write a Query with a Right Outer Join in MS SQL Server?

Submitted by: Administrator

If you want to query from two tables with a right outer join, you can use the RIGHT OUTER JOIN ... ON clause in the FROM clause. The following query returns output with a right outer join from two tables: ggl_links and ggl_rates. The join condition is that the id in the ggl_links table equals to the id in the ggl_rates table:

SELECT l.id, l.url, r.comment FROM ggl_links l
RIGHT OUTER JOIN ggl_rates r ON l.id = r.id
GO
id url comment
101 www.globalguideline.com The best
102 www.globalguideline.com/html Well done
103 www.globalguideline.com/sql Thumbs up
NULL NULL Number 1
NULL NULL Not bad
NULL NULL Good job
NULL NULL Nice tool

Note that a right outer join may return extra rows from the second (right) table that do not satisfy the join condition. In those extra rows, columns from the first (left) table will be given null values.

The extra rows returned from the right outer join in this example represents rates that have no links in the above example.
Submitted by: Administrator