Well, since, I'm the maintainer of all of those modules, I don't really have anywhere to pass it on to :-). Testing as we speak, I'll update when I have an answer and please /msg if you find something out in the meantime.

update1

Very, very odd. I got the same fubared results you did. But when I run the test below (which uses all the same SQL as yours), everything is copacetic. More later. 
#! /usr/bin/perl -w
use strict;
use DBI;
use FindBin;
open my $fh, '>', $FindBin::Bin . '/Tanktalus';
print $fh ("DATE,NUMBER\n2005-05-16,2\n2005-05-17,4\n");
close $fh;

my $dbh = DBI->connect("dbi:CSV(RaiseError=1):csv_eol=\n");
for my $sql(<DATA>){
    my $sth = $dbh->prepare($sql);
    $sth->execute;
    $sth->dump_results if $sth->{NUM_OF_FIELDS};
}
__END__
SELECT date,number FROM Tanktalus
SELECT SUM(number) from Tanktalus
UPDATE Tanktalus SET number=8 WHERE date='2005-05-17'
SELECT date,number FROM Tanktalus
SELECT SUM(number) from Tanktalus
SELECT number FROM Tanktalus WHERE date = '2005-05-17'

[download]

update2

Ok, I can reproduce the error by using placeholders for the update in the script above. It's a SQL::Statement problem. Fix coming by morning.

update3

Ok, I found and fixed the bug in SQL::Statement. Please try grab the latest from the SVN repository and let me know if it works for you. I thanked you for the bug report in the Changes log of the distro.

In reply to Re: DBD::CSV, SQL::Statement, and UPDATE table statement by jZed
in thread DBD::CSV, SQL::Statement, and UPDATE table statement by Tanktalus

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.