Set SQL SUM() query to a PHP variable, and echo result

Question

I am trying to pull in the sum of all values in a database column, assign it to a PHP variable and display the value.

$total_drop_query = mysqli_query("SELECT SUM(total_drops) FROM pi_data");

$row = mysqli_fetch_assoc($total_drop_query);

$total_drops = $row['total_drops'];

echo $total_drops;

This code isn't displaying any results, and it's driving me crazy!

Thanks in advance.

Answer 1

You are not printing SUM but 'total_drops' value , that in sql you have not select. It's good thing to use an alias when you use SUM or Count in sql:

SELECT SUM(total_drops) AS something FROM pi_data"

so:

$total_drops = $row['something'];

Answer 2

I've set up a table with your structure - the query works well so I think that you have the error in accessing the data.

I suggest you using aliases

SELECT SUM(total_drops) AS a FROM pi_data

access is possible via

$total_drops = $row['a'];