NULL value question

I'm coding my first web site using a mysql
database and DBI.

I can fetch records from the database
with no problem, but I'm having trouble
testing NULL values. If I load the value
of a date field into a variable ($dateadded),
how should the IF condition be written?

if ( $dateadded = NULL ) {

print "Date added is NULL";

}

I found some information that talked
about NULLs being undef, but I'm
not sure how to use that information.
.

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