Mysql结构和日期:
--
-- Table structure for table `site_links`
--
CREATE TABLE IF NOT EXISTS `site_links` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`username` varchar(15) NOT NULL,
`link_title` varchar(255) NOT NULL,
`link_url` text NOT NULL COMMENT,
`status` tinyint(1) NOT NULL DEFAULT '0',
`views_count` int(11) unsigned NOT NULL DEFAULT '0',
`unlocks_count` int(11) unsigned NOT NULL DEFAULT '0',
`report_count` int(11) unsigned NOT NULL DEFAULT '0',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=74 ;
--
-- Dumping data for table `site_links`
--
INSERT INTO `site_links` (`id`, `username`, `link_title`, `link_url`, `status`, `views_count`, `unlocks_count`, `report_count`) VALUES
(56, 'john', 't1', 'http://google.com', 1, 4, 0, 0),
(57, 'john', 't2', 'http://google.com', 1, 0, 0, 0),
(58, 'james', 't3', 'http://google.com', 1, 3, 0, 0),
(59, 'dave', 't4', 'http://google.com', 1, 8, 0, 0),
(60, 'john', 't4', 'http://google.com', 1, 5, 0, 0),
我需要对用户名 "john" 的 "view_count" 值求和,所以输出应该是 "9"
我试过这个
<?php
$dpl = $db->query("SELECT SUM(`views_count`) FROM site_links WHERE username='john'",true);
echo $dpl;
?>
但它不能正常工作,我收到此错误“资源 id #92”
请问我该怎么做?
谢谢