change site url wordpress database

                                    options table
1. siteurl
2. home

######## OR ########

// Add to top of wp-config.php
define( 'WP_HOME', 'http://example.com' );
define( 'WP_SITEURL', 'http://example.com' );

                                    define('WP_HOME','http://example.com'); 
define('WP_SITEURL','http://example.com');

                                    # Check your table prefix
# Change all the tables 

UPDATE wp_options SET option_value = 
replace(option_value, 'oldurl.com', 'newurl.com') WHERE option_name = 'home' 
OR option_name = 'siteurl';UPDATE wp_posts SET guid = 
replace(guid, 'oldurl.com','newurl.com');
UPDATE wp_posts SET post_content = replace(post_content, 'oldurl.com', 'newurl.com');

UPDATE wp_postmeta SET meta_value = replace(meta_value,'oldurl.com','newurl.com');