Difficulties with transferring Wordpress to a subdomain of another domain. Why is he trying to get up from scratch?

Question

WordPress

1. I transfer the site to Wordpress from one domain to a subdomain of the second domain in order to have a copy for improvements.
2. Done: files copied, database tables successfully imported, data for connecting to the database registered, queries replaced the old domain with a new subdomain in the database records. Everything is as always
Unexpected result: when opening any page on a new copy, Wordpress tries to install from scratch. Prompts to enter the site name, username, etc. What am I doing wrong?

Answer 1

Lord, I found the reason. The database was imported with table prefixes in lowercase, and in config.php the prefix was specified in uppercase. At the same time, inside the database in the records, the prefix is ​​always indicated with uppercase - however, I, I believe, will figure it out with this.