fetchrow_array returns an array and it is assigning into an array. This is a pretty standard idiom for reading single columns. The while loop even distinguishes between an empty array for end of the data set and undef for NULL value. 
my ($identifier)=$sth->fetchrow_array();

my @array = $sth->fetchrow_array();
($identifier) = @array;

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In reply to Re: Re: selecting again from a mysql database by iburrell
in thread selecting again from a mysql database by bory

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