Yup, because 
    select username from user where address=foo@ebi-llc.com

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isn't valid SQL. Use a place holder: 
    my $sql = qq(select username from user where address=?);
    my $sth1 = $dbh->prepare($sql);
    $sth1 -> execute ($address);

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Abigail

In reply to Re: Can't pass email address in SQL select statement by Abigail-II
in thread Can't pass email address in SQL select statement by davart

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