You don't say what type of column NOTES is, but if it's potentially large (like a BLOB, (LONG)TEXT or MEMO field) then you need to play with DBI->connect's LongTruncOk and/or LongReadLen attributes.

$dbh = DBI->connect(
  'dbi:ODBC:StockDB',
  '',
  '',
  {
    LongTruncOk => 1,
    LongReadLen => 1024 * 64, # 64K
  },
) || ...
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    --k.