使用COUNT（*）返回Mysql结果

Question

I'm trying to return a count from mysql. My code is below

$number_of_options_sql = tep_db_query("SELECT COUNT( * ) FROM 
(select sum(options_id) as total from products_attributes 
where products_id='".$products_id."' group by options_id) as total");
$number_of_options_result = tep_db_fetch_array($number_of_options_sql);

When I run this query in Phpmyadmin, it shows the result with COUNT(*) at the table heading. I'm getting the correct result, the query works for me, I just can't print it out on the screen.

I've tried returning the value the following ways and neither print anything on the screen:

echo $number_of_options_result[COUNT( * )];
echo $number_of_options_result[total];

Answer 1

Your query is assigning an alias to the table/query not the column. use this one below:

$number_of_options_sql = tep_db_query("SELECT COUNT(*) as total FROM (select sum(options_id) as total from products_attributes where products_id='".$products_id."' group by options_id) a");
$number_of_options_result = tep_db_fetch_array($number_of_options_sql); 

Also looks like you want to know count of distinct options id for a product_id, I would rewrite the query as follows:

$number_of_options_sql = tep_db_query("SELECT COUNT(DISTINCT options_id) as total FROM  products_attributes WHERE products_id='".$products_id."'");