How can I SELECT all table rows with data to display total number with data

Question

I'm trying to show the total amount of say people with kittens.

$query = mysql_query("SELECT * FROM people.kittens WHERE IS NOT NULL");

The issue is the field is not set to NULL and is either blank or has data. Then I would show the total number with:

$Totalpeoplewithkittens = mysql_num_rows($query);

I know mysql_query is outdated. Just testing/learning.

Answer 1

关于什么

$query = mysql_query("SELECT count(kittens) FROM people WHERE kittens > ''");

Answer 2

像从...选择计数（*）一样使用