Restore posts via SQL

Hello,
I tried to restore my posts from a older database to the new one. If I export the posts from the old database, there is no problem but they are without categories. So I tried to export these tables:

wp_posts
wp_postmeta
wp_term_relationships
wp_term_taxonomy
wp_terms and
wp-termmeta

But when I tried to import these to the new database, the tables are still empty. How can I fix this? I also saved them as .xml but I doesn´t work, it´s uploading but nothing is added to WordPress. I have also renamed the tables to ne new prefix gowp_posts etc.

Any idea?