WordPress Developers Club Challenge - What is the SQL to get the count of all post meta where post ID = 1?

challenge.php

/**
 * Get the number of meta for a specific Post ID
 * 
 * @since 1.0.0
 * 
 * @param integer   $post_id    Post ID to query for
 * @return integer              Returns the count number
 */
function tonya_get_meta_count_for_post_id( $post_id ) {

	global $wpdb;

	return $wpdb->get_var( $wpdb->prepare( 
		"
			SELECT COUNT(*) 
			FROM {$wpdb->postmeta} 
			WHERE post_id = %d
		", 
		$post_id 
	) );		
}

/**
 * Get the count for a specific Post ID and meta key
 * Another version of the above function (food for thought)
 *
 * @since 1.0.0
 *
 * @param integer   $post_id    Post ID to query for
 * @param string    $meta_key   Meta Key to query for
 * @return integer              Returns the count number
 */
function tonya_get_count_for_post_id_and_meta_key( $post_id, $meta_key ) {

	global $wpdb;

	return $wpdb->get_var( $wpdb->prepare(
		"
			SELECT COUNT(*) 
			FROM {$wpdb->postmeta} 
			WHERE post_id = %d AND meta_key = %s
		",
		$post_id, $meta_key
	) );
}