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SET @oldsite='http://oldsite.com';
 SET @newsite='http://newsite.com';
 UPDATE wp_options SET option_value = replace(option_value, @oldsite, @newsite) WHERE option_name = 'home' OR option_name = 'siteurl';
 UPDATE wp_posts SET post_content = replace(post_content, @oldsite, @newsite);
 UPDATE wp_links SET link_url = replace(link_url, @oldsite, @newsite);
 UPDATE wp_postmeta SET meta_value = replace(meta_value, @oldsite, @newsite);

/* only uncomment next line if you want all your current posts to post to RSS again as new */
 #UPDATE wp_posts SET guid = replace(guid, @oldsite, @newsite);
 
OR 

UPDATE wp_options SET option_value = replace(option_value, 'http://www.oldsite.com', 'http://www.newsite.com') WHERE option_name = 'home' OR option_name = 'siteurl';
UPDATE wp_posts SET guid = replace(guid, 'http://www.oldsite.com','http://www.newsite.com');
UPDATE wp_posts SET post_content = replace(post_content, 'http://www.oldsite.com', 'http://www.newsite.com');
UPDATE wp_postmeta SET meta_value = replace(meta_value, 'http://www.oldsite.com', 'http://www.newsite.com');

Or

UPDATE wp_posts SET guid = replace(guid, 'http://www.old-domain.com','http://www.new-domain.com');
UPDATE wp_posts SET post_content = replace(post_content, 'http://www.old-domain.com', 'http://www.new-domain.com');
UPDATE wp_postmeta SET meta_value = replace(meta_value, 'http://www.old-domain.com', 'http://www.new-domain.com');
UPDATE wp_options SET option_value = replace(option_value, 'http://www.old-domain.com', 'http://www.new-domain.com') WHERE option_name = 'home' OR option_name = 'siteurl';