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我正在尝试获取MySQL查询中的变量。$filter = $_GET['fltr'];if($filter) $limit = 'LIMIT '.$filter;$lastonline = mysql_query("SELECT * FROM logins ORDER BY time DESC GROUP BY username '$l
如何过滤只处理最新更新信息的数据?这是样本数据。United States of America 2000 Dentistry personnel density 162.7United States of America 2000 Laboratory health workers 228.4
United States of America 1995 Nursing and