WP_User_Search::query()

Source

public function query() {
	global $wpdb;

	$this->results = $wpdb->get_col("SELECT DISTINCT($wpdb->users.ID)" . $this->query_from . $this->query_where . $this->query_orderby . $this->query_limit);

	if ( $this->results )
		$this->total_users_for_query = $wpdb->get_var("SELECT COUNT(DISTINCT($wpdb->users.ID))" . $this->query_from . $this->query_where); // No limit.
	else
		$this->search_errors = new WP_Error('no_matching_users_found', __('No users found.'));
}

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