Hi,

Some RDBMS that support the NATURAL JOIN syntax use roughly this SQL
grammar:
NATURAL [ { LEFT | RIGHT } [ OUTER ] | INNER ] JOIN

Example Derby:
http://download.oracle.com/javadb/10.6.2.1/ref/rrefsqljnaturaljoin.html

Example Oracle:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/statements_10002.htm#CHDIJFDJ

H2 only allows for "inner" NATURAL JOINs:
http://www.h2database.com/html/grammar.html#table_expression

I guess, the NATURAL JOIN syntax is a rather low priority. But still,
that might be a nice enhancement to H2...?

Cheers
Lukas

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