mysql - Update a column with the data of another column of another table

Question

I have two tables

1. titles_downloads
2. title_history

Currently i am saving idtitle_history in titles_downloads as a column. The title_history has a column idtitle which is different from idtitle_history.

I want to change the idtitle_history in my titles_downloads table to idtitle

Example data for title_history table

       idtitle_history                 idtitle
            1                             160
            2                             210
            3                             345

titles_downloads

       iddownloads                      idtitle_history
            1                              1
            2                              2
            3                              3

I want to replace the idtitle in this table to 160, 210, 345 ...

Thanks

Answer 1

尝试

update titles_downloads
inner join title_history 
on title_history.idtitle_history  = titles_downloads.idtitle_history 
set idtitle_history = title_history.idtitle

Answer 2

尝试这个：

UPDATE titles_downloads td
JOIN title_history th ON td.iddownloads = th.iddownloads
SET th.iddownloads = td.idtitle