Question

运行SQl查询以返回查询的总计数。

此代码在使用PHPmyAdmin

运行SQL时有效

但是在页面上它没有显示计数的回声？

不确定我是否可以在这里忽略一些东西。

非常感谢！

$sql2=mysql_query("SELECT count(*) 
FROM main_table LEFT JOIN houses ON main_table.housenumber = houses.housenumber AND main_table.streetname = houses.streetname
WHERE main_table.city='1'
group by main_table.city ORDER BY average DESC, houseID DESC, reviewID DESC;");

while($row=mysql_fetch_array($sql2))
{
    $count=$row['count'];
    echo $count;;
}

Answer 1

试试这个......

$sql2=mysql_query("SELECT 
      COUNT(*) AS count
    FROM
      main_table 
      LEFT JOIN houses 
        ON main_table.housenumber = houses.housenumber 
        AND main_table.streetname = houses.streetname 
    WHERE main_table.city = '1' 
    GROUP BY main_table.city 
    ORDER BY average DESC,
      houseID DESC,
      reviewID DESC") ;

    while($row=mysql_fetch_array($sql2))
    {
        $count=$row['count'];
        echo $count;
    }

您的查询中有错误，您不是在选择别名时添加计数，而在使用别名时将其添加到下面。试试这个。

Answer 2

为您的专栏命名：

...mysql_query("SELECT count(*) as count....

Answer 3

添加SELECT count(*) as 'count' from ...

Answer 4

尝试使用以下命令启动查询：

SELECT count(*) as count ...

SQL查询不返回计数值

4 个答案: