DEDECMS Bulk Delete document keywords OK?

These days in the re-server, several sites are built with Dedecms, the version is relatively early, although all have been patched, but the customer is still tangled, so download a new system to build (note the code to be the same as the original), import data, everything is OK, Can be found in the background there are a lot of document keywords are irrelevant, so it is not as straightforward to delete, the problem came, hundreds of data, a page to delete when, how to bulk deleted it?

DELETE from Dede_keywords

One line of code is easy to fix.

What if you want to delete search keywords in bulk? Can be achieved, too.

Delete from Dede_search_cache;delete from Dede_search_keywords;

Well, the rest of the time can be fun to play.

DEDECMS Bulk Delete document keywords OK?