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I have a site that version was 1.1.8.Then i wanted 2 upgrade 2 1.20 but i couldn't upgrade 'coz of db error.Then i installed 1.2.1 and i attached my 1.1.8 db.
Does it work healthy?

No, it will not.

There are database structure changes from 1.1.8 to 1.2.1

What was the db error?

No. That is not a good idea. It doesn't really make a whole lot of sense either. Currently your running 1.2.1 files with a 1.1.8 database, not a good combination to say the least. Please attempt the convert again, and post any and all errors you get here so we can assist you.

I can't stress this enough, please also make sure you have a complete database/file backup.