MariaDB [border-radio]> UPDATE wp_posts SET post_content = REPLACE( post_content, 'src="http://www.border-radio.it/', 'src="/' );
Query OK, 349 rows affected (0.130 sec)
Rows matched: 3175  Changed: 349  Warnings: 0

MariaDB [border-radio]> UPDATE wp_posts SET post_content = REPLACE( post_content, 'src="http://border-radio.reyboz.it/', 'src="/' );
Query OK, 16 rows affected (0.071 sec)
Rows matched: 3175  Changed: 16  Warnings: 0

MariaDB [border-radio]> UPDATE wp_posts SET guid = REPLACE( guid, 'http://border-radio.reyboz.it/', 'http://www.border-radio.it/' );
Query OK, 887 rows affected (0.033 sec)
Rows matched: 3175  Changed: 887  Warnings: 0