Difference between ON and WHERE in JOINs

[Jean-Christophe Boggio <postgresql@xxxxxxxxxxxxxx>]

I'm looking for an article that explains the difference between these 
constructs IN POSTGRESQL (the rules seem to differ from one DB to another) :

SELECT A.*
FROM A
JOIN B ON a.id=b.id AND A.somefield='somevalue'

and

SELECT A.*
FROM A
JOIN B ON a.id=b.id
WHERE A.somefield='somevalue'


I have noticed big differences though I don't know the rules and I've 
been bitten several times recently. Time to learn.

Thanks,

JC


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