insert using sub-query and inner join

Question

i have these two tables.
The first is the users_details table

Second is the users_posts table.

i want to fill the column postedby_name with username from the first column.

I tried a combination of inner join and sub-query but could not do it.

This is the code that i have now.

update users_posts
set users_posts.postedby_name = 
(select username from users_details inner join users_posts where
users_posts.postedby = users_details.id);

How to Accomplish this.?

Answer 1

Update users_posts inner join users_details  
on users_posts.postedby = users_details.id 
set users_posts.postedby_name=users_details.username