document.write("<div class=\"item\">    <div class=\"title\"><a href=\"http://www.itpow.com/c/712.asp\" target=\"_blank\"><span class=\"key\">SQLServer</span> <span class=\"key\">中的</span> <span class=\"key\">ISNULL</span> <span class=\"key\">和</span> <span class=\"key\">NULLIF</span></a></div>    <div class=\"abstract\"><span class=\"pubDate\">2006年03月03日</span> SQL Server里的 <span class=\"key\">ISNULL</span> 与 ASP <span class=\"key\">中的</span> <span class=\"key\">IsNull</span>不同，SQL Server 中有两个参数，语法：<span class=\"key\">ISNULL</span>(check_expression, replacement_va</div>    <div class=\"url\"><a href=\"http://www.itpow.com/c/712.asp\" target=\"_blank\">http://www.itpow.com/c/712.asp</a></div></div>")