SQL查询未返回计数值

Question

SQl query running to return the total count from the query.

this code works when running SQL with PHPmyAdmin

But on the page it is not displaying echo of the count ?

Not sure if I could have overlooked something here.

Many Thanks!

$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

Try this ....

$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;
    }

You have mistake in your query, you are not adding count in select as aliases, and below in while you are using aliases . Try this.

Answer 2

命名您的专栏：

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

Answer 3

SELECT count(*) as 'count' from ...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 ...