Check out example codes for "wordpress sql change site url". It will help you in understanding the concepts better.

Code Example 1

# Check your table prefix
# Change all the tables 

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

UPDATE wp_postmeta SET meta_value = replace(meta_value,'','');

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