insert into new_database.wp_users(
login,user_pass,user_nicename,user_email,user_url,user_registered,user_activation_key,user_status,
display_name
)
select
login,user_pass,user_nicename,user_email,user_url,user_registered,user_activation_key,user_status,
display_name
from old_database.wp_users;
Obviously, adjusted for your circumstances.
HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.
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And its a free tool too :-)
good luck, and YES: Backup :-)
regards, W