Natural join in SQL Server

Question

Is there any support for natural joins in recent Microsoft SQL Server editions? Or is there a good alternative for making SQL Server work out the predicates that would have been in the ON clauses based on the referential integrity?

Answer 1

No, and thank the lucky stars

I can't believe that you'd want the engine to guess the JOIN for you

Related links:

• SQL Server - lack of NATURAL JOIN / x JOIN y USING(field)
• is NATURAL JOIN any better than SELECT FROM WHERE in terms of performance ?

Edit, to explain why

• The JOIN (whether USING or ON) is clear and explicit
• I should be able to name my columns for the entity stored in the table, without worrying about what a column is called in another table, without NATURAL JOIN side effects

Quoting Bill Karwin in this excellent answer:

I never use NATURAL JOIN because I don't like the possibility that the join could do something I don't intend just because some column name exists in both tables.

Answer 2

MS SQL does not support natural join, neither join using (). You have to explicitly write down all your attributes used in the join.

If the datamodel changes, you have to change all "natural join" written by hand and make sure your join condition is ok again.