in reply to Re: Re: What is truth? (Curiosity corner)
in thread What is truth? (Curiosity corner)

"0E0" is used by the DBI (and DBD's) for eg. $sth->execute when the SQL-statement processed 0 rows but did not error.

This allows constructions like my $rows=$sth->execute or die "SQL error" ( Of course this would be expressed better using $dbh->{RaiseError} = 1).

The relevant part of the DBI documentation states:

For a non-`SELECT' statement, `execute' returns the number of rows affected, if known. If no rows were affected, then `execute' returns "`0E0'", which Perl will treat as 0 but will regard as true. Note that it is not an error for no rows to be affected by a statement. If the number of rows affected is not known, then `execute' returns -1.