What is the difference between a natural join and an inner join?

I can understand how natural join works when the two tables have only one common attribute. What if they have two ones? Table 1 have 3 attributes: A, B, C Table 2 has 3 attribute: A, B, D F...

I've been trying to understand the concept of sql joins fully, venn diagrams have helped me a lot to do that. I've found them for all kind of joins but not for natural joins. How would a venn dia...

I am reading about NATURAL shorthand form for SQL joins and I see some traps: it just takes automatically all same named column-pairs (use USING to specify explicit column list) if some new colum...

I have two tables in mysql server. I use these tables for studing JOIN multiple tables but something appears to be incorrect: mysql> select * from category; +-------------+-----------+ | catego...

Disclaimer: I'm a developer and not a DBA. I've been a huge fan of the USING clause in Oracle since I accidentally stumbled upon it and have used it in place of the old-fashioned ON clause to join...

What will natural join return in relational algebra if tables don't have attributes with same names? Will it be null or the same as cross join (cross product) (Cartesian product)?

CREATE TABLE subscription ( magazine_id bigint, user_id bigint, PRIMARY KEY (magazine_id, user_id) ); CREATE TABLE delivery ( magazine_id bigint, user_id bigint, FOREIGN KEY (subscription) R...

I know the beautiful usage of the SQL clause "USING": it is similar to NATURAL JOIN but you must detail the join columns; you can join more simply (and faster) the tables that have the same key and...