从php中的mysql表中选择count（*） [英] select count(*) from table of mysql in php

问题描述

我可以得到mysql查询结果的值和行。

但我很难得到查询的单个输出。例如：

  $ result = mysql_query（SELECT COUNT（*）FROM Students;）; 
  

我需要显示结果。但我没有得到结果。

我尝试了以下方法：

1. mysql_fetch_assoc（）


2. mysql_free_result

3. mysql_fetch_row（）



您需要使用别名来对聚合进行别名，作为关键字，以便从 mysql_fetch_assoc

中调用

  $ result = mysql_query（SELECT count（*）as total from Students）; 
 $ data = mysql_fetch_assoc（$ result）; 
 echo $ data ['total']; 
  

I am able to get both the value and row of the mysql query result.

But I am struggling to get the single output of a query. e.g.:

$result = mysql_query("SELECT COUNT(*) FROM Students;");

I need the result to display. But I am not getting the result.

I have tried with the following methods:

1. mysql_fetch_assoc()
2. mysql_free_result()
3. mysql_fetch_row()

But I didn't succeed to display (get) the actual value.

解决方案

You need to alias the aggregate using the as keyword in order to call it from mysql_fetch_assoc

$result=mysql_query("SELECT count(*) as total from Students");
$data=mysql_fetch_assoc($result);
echo $data['total'];

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