How to get sum value of usermeta key using another meta key - mysql

Question

I have two meta key: us_points & agent_id
I need to sum up all the us_points value with agent ID same for each users.
Here is what I tried:
$cuser = wp_get_current_user(); $a_id = $cuser->agent_id;
global $wpdb;
$result = $wpdb->get_col("SELECT sum(meta_value) FROM $wpdb->usermeta WHERE meta_key = 'us_points' AND agent_id = $a_id" );
echo $result[0];
If I remove AND agent_id = $a_id, it shows the sum of all users in the website, but I need to show the sum of only the meta key value common/matching in agent_id
Help will me much appreciated.

Answer 1

Try this, It should target agent_id meta key then group records by the same agent_id value before summing.
$result = $wpdb->get_col("SELECT sum(meta_value) FROM $wpdb->usermeta WHERE meta_key = 'us_points' GROUP BY meta_value HAVING 'meta_key' = 'agent_id'" );

Answer 2

$users = get_users();
$agent_points = array();
foreach( $users as $user ) {
$agent_points[] = array(
'agent_id' => $user->agent_id,
'us_points' => $user->us_points,
);
}
$agent_points expected to be in the structure:
Array
(
[0] => Array
(
[agent_id] => 1
[us_points] => 30
)
[1] => Array
(
[agent_id] => 4
[us_points] => 10
)
[2] => Array
(
[agent_id] => 4
[us_points] => 30
)
[3] => Array
(
[agent_id] => 1
[us_points] => 20
)
)
Then,
$results= array();
foreach( $agent_points as $values ) {
foreach( $values as $key => $value ) {
if( 'agent_id' === $key ) {
$results[ $value ] += $values['us_points'];
}
}
}
Expected $results in agent_id => us_points pair:
Array
(
[1] => 50
[4] => 40
)