delete with cascade

I was reading the manuals on DELETE and I saw this:

By default DELETE will delete tuples in the table specified and all its
sub-tables. If you wish to only update the specific table mentioned, you
should use the ONLY clause.

I just don't understand what sub-tables means. Does it mean that it will
delete rows on other tables which are referenced with a FOREIGN KEY to the
row which will be deleted?

Saludos... :-)

--
El mejor sistema operativo es aquel que te da de comer.
Cuida tu dieta.
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Martin Marques                  |        mmarques@unl.edu.ar
Programador, Administrador      |       Centro de Telematica
                       Universidad Nacional
                            del Litoral
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