警告: mysql_num_rows()期望参数1是第x行的资源。我检查了所有丢失的单引号和sql链接。$query_1 = sprintf("select part_of_speech_id from word_parts_of_speech where word = '%s'", mysql_real_escape_string($v)); if(mysql_num
我有Group_ConCat函数的select查询吗?现在的问题是,在回显行之后,ID没有显示在页面上?$querypid=mysql_query("SELECT GROUP_CONCAT(`id`) FROM products ORDER BY id") or die("PID Query");echo $i