how to set up the SQL code for multisites?

Hi, I am trying to figure out how to modify the SQL code for the database of a multisite domain, with lots of sub-domains.

As my understanding, after changing the path, I will need to do followings.

UPDATE XX_posts
SET guid = REPLACE (guid, ‘http://www.old-website.com’, ‘http://www.new-website.com’);
WHERE post_type = ‘attachment’

UPDATE XX_posts
SET post_content = REPLACE (post_content, ‘http://www.old-website.com/wp-content/uploads’,’ http://www.new-website.com/wp-content/uploads);

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But, how do I do this for an WPMU site?

I have checked the database, it seems all original upload-path is not stored at /wp-content/uploads/, hence, not in the wp_x_options in the database.

Is there anyone could help me to sort this out, please?