如何在mysql中打印计数？

Question

查询：

$query=mysql_query(SELECT content_id, COUNT(*) FROM votingapi_vote WHERE value_type = option  AND value = 1 GROUP BY content_id)

如果我将其分配给$result。

while ($obj = db_fetch_object ($result)) {
  $output .= $obj->content_id.'<br>' . $obj->count;
}

如何输出计数？在$obj->content_id之后。没有打印数字。谢谢。

Answer 1

您的列COUNT(*)需要别名（即重命名该列）：

SELECT content_id, COUNT(*) as count FROM [...]

然后使用变量：

$obj->count

Answer 2

为计数添加别名，例如：

SELECT content_id, COUNT(*) as the_count FROM ...

然后你可以用这个名字来引用它：

$output .= $obj->content_id.'<br>' . $obj->the_count;    

Answer 3

$query=mysql_query(SELECT content_id, COUNT(*) as count FROM votingapi_vote WHERE value_type = option  AND value = 1 GROUP BY content_id)

Answer 4

更改

COUNT(*) FROM

到

COUNT(*) as count FROM

Answer 5

尝试添加：$ query = mysql_query（SELECT content_id，COUNT（*） * as the_count * FROM votingapi_vote WHERE value_type = option AND value = 1 GROUP BY content_id）

然后计数应该是$ obj-＆gt; the_count