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Calculate the sum of an entire result set of values with a single SQL query

As tested in phpMyAdmin:

SELECT SUM( `value` )
FROM `dru_ec_product_zing_auction` AS za
LEFT JOIN `dru_node` AS n ON za.nid = n.nid
WHERE STATUS > 0;

Drupalized:
SELECT SUM(value) FROM {ec_product_zing_auction} AS za LEFT JOIN {node} AS n ON za.nid = n.nid WHERE status > 0

As actually used in a Drupal module, zing_auction:

<?php
  $query = "SELECT SUM(value) FROM {ec_product_zing_auction} AS za LEFT JOIN {node} AS n ON za.nid = n.nid WHERE status > 0";
  $totestvalall = db_result(db_query($query));
?>

Resolution

Searched words: 
MySQL SUM

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