1

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'campaign_name',
		'value'   => 'blue',
		'compare' => '=',
		'type'    => 'CHAR',
	),
	array(
		'key'     => 'id',
		'value'   => 'red',
		'compare' => '!=',
		'type'    => 'NUMERIC',
	),
);