WordPress/ACF: Sort Posts by multiple fields - wordpress

Question

i have posts with two advanced custom fields "name" and "surname"
and i need to query the post to have it in the right sequece.
name / surnname / title
like this:
Doe, Joen, Title
my query looks like this
$args = array(
'numberposts' => -1,
'post_type' => array ('events'),
'meta_key' => 'name',
'orderby' => 'meta_value',
'order' => 'ASC',
'meta_query'=> array(
array(
'key' => 'date',
'compare' => '<',
'value' => $today,
'type' => 'DATE',
)),
);
How can I order the posts in the right way?
i tried something like this:
'orderby' => 'meta_value surname',
but i think this dont work with custom fields
thanks!!!
++
thanks alot Mukesh!
this works (i hope so…)
SELECT SQL_CALC_FOUND_ROWS * FROM wpdev_posts
INNER JOIN wpdev_postmeta ON ( wpdev_posts.ID = post_id )
INNER JOIN wpdev_postmeta AS mt1 ON ( wpdev_posts.ID = mt1.post_id )
INNER JOIN wpdev_postmeta AS mt2 ON ( wpdev_posts.ID = mt2.post_id )
WHERE 1=1 AND ( wpdev_postmeta.meta_key = 'referent_name' ) AND ( mt1.meta_key = 'referent_vorname' )
AND ( ( mt2.meta_key = 'datum' AND CAST(mt2.meta_value AS DATE) < 20190527 ) )
AND wpdev_posts.post_type = 'veranstaltungen'
AND (wpdev_posts.post_status = 'publish'
OR wpdev_posts.post_status = 'pending' OR wpdev_posts.post_status = 'confirmed'
OR wpdev_posts.post_status = 'paid' OR wpdev_posts.post_status = 'complete'
OR wpdev_posts.post_status = 'private')
GROUP BY wpdev_posts.ID
ORDER BY wpdev_postmeta.meta_value ASC, mt1.meta_value ASC, post_title ASC

Answer 1

Try below code it will help to you.
<?php
global $wpdb;
$query = "SELECT SQL_CALC_FOUND_ROWS * FROM $wpdb->posts
INNER JOIN $wpdb->postmeta ON ( $wpdb->posts.ID = $wpdb->postmeta.post_id )
INNER JOIN $wpdb->postmeta AS mt1 ON ( wp_posts.ID = mt12.post_id )
INNER JOIN $wpdb->postmeta AS mt2 ON ( wp_posts.ID = mt2.post_id )
WHERE 1=1 AND ( $wpdb->postmeta.meta_key = 'name' ) AND ( mt1.meta_key = 'surname' )
AND ( ( mt2.meta_key = 'date' AND CAST(mt2.meta_value AS DATE) < $today ) ) )
AND $wpdb->posts.post_type = 'events' AND ($wpdb->posts.post_status = 'publish'
OR $wpdb->posts.post_status = 'pending' OR $wpdb->posts.post_status = 'confirmed'
OR $wpdb->posts.post_status = 'paid' OR $wpdb->posts.post_status = 'complete'
OR $wpdb->posts.post_status = 'private')
GROUP BY wp_posts.ID
ORDER BY wp_postmeta.meta_value ASC, mt1.meta_value ASC ";
$posts = $wpdb->get_results($query, object);
echo '<pre>';print_r($posts);
?>