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？
解决方案
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"