如何从MySQL查询中将MAX值赋给PHP变量？

Question

I want to store the MAX value of the following mySQL query :

$maxTF = mysql_query("SELECT MAX(tf) AS maxTF FROM my_database")or die(mysql_error());

echo $maxTF;

But i didn't get the value. Could someone tell how to make it works ? thanks in advance.

Answer 1

$maxTF isn't the value being selected, it's the result of the query . Which is an object itself from which you can fetch records and values. In this case exactly one record will be returned by this query, and that record will contain exactly one value.

Looking at the documentation shows some examples you can use. (When doing so, do also pay attention to that red box at the top of the page. You're using a data connection library that's no longer supported.) Something like this:

$row = mysql_fetch_assoc($maxTF);
echo $row['maxTF'];