以下是我的php代码：，
$sql = "SELECT author,tags,subject,tid,authorid,dateline,fid FROM threads ORDER BY dateline DESC LIMIT 10"
如果tags是空值，则跳过，该怎么改呢？
以下是我的php代码：，
$sql = "SELECT author,tags,subject,tid,authorid,dateline,fid FROM threads ORDER BY dateline DESC LIMIT 10"
如果tags是空值，则跳过，该怎么改呢？
如果空值是:NULL
则：
$sql = "SELECT author,tags,subject,tid,authorid,dateline,fid FROM threads WHERE tags IS NOT NULL ORDER BY dateline DESC LIMIT 10"
如果空值是:''
$sql = "SELECT author,tags,subject,tid,authorid,dateline,fid FROM threads WHERE tags !='' ORDER BY dateline DESC LIMIT 10"
每个人都需要一台速度更快、更稳定的 PC。随着时间的推移，垃圾文件、旧注册表数据和不必要的后台进程会占用资源并降低性能。幸运的是，许多工具可以让 Windows 保持平稳运行。
Copyright 2014-2025 https://www.php.cn/ All Rights Reserved | php.cn | 湘ICP备2023035733号
793
收藏
