I need to get the sum of all points values of the user with uid 1 from the test_sum_expression table. But when I try to execute I get this message Error: Call to a member function execute() on string.

If I don't execute, I get the count 6 of the word points, as if it were counting the characters from the string points.
enter image description here

$queryPoints = $connection->select('test_sum_expression', 'n')
    ->fields('n', ['uid', 'points'])
    ->condition('n.uid', 1, '=')
    ->addExpression('SUM(n.points)', 'points')


Mysql table with two columns (uid, points)

enter image description here

1 Answer 1


This is because addExpression() returns the unique alias assigned to the expression, and not the query. You can fix this by adjusting your code as follows:

$query = $connection->select('test_sum_expression', 'n')
    ->fields('n', ['uid', 'points'])
    ->condition('n.uid', 1, '=')
$query->addExpression('COUNT(n.points)', 'points');
$queryPoints = $query->execute();
  • Thanks for your answer. But by mistake in the question I wrote the code with COUNT instead of SUM. My apologies. I've corrected the question. Does this code work with SUM? I'm getting with dpm($queryPoints): $queryPoints Drupal\Core\Database\StatementWrapper#458455 (3) Jul 10, 2023 at 21:15
  • 2
    addExpression() returns a string, whether you pass it SUM or COUNT, so my code is the same either way. Whether that code does what you are hoping is a different question - I am helping with the syntax only.
    – Jaypan
    Jul 10, 2023 at 21:59

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