Question

I have a table posts with the column published, which is either 0 (unpublished) or 1 (published).
Say I want to make all the published posts into unpublished posts and all the unpublished posts into published posts.
I know that running

UPDATE posts SET published = '1' WHERE published = '0';
UPDATE posts SET published = '0' WHERE published = '1';

will end up turning all my posts into published posts.
How can I run these queries in the mysql command line so that it truly “reverse” the values, as opposed to the mistake outlined above?

Thanks

EDIT: assume the data types are strings. I know ints/bools are a much better way to do this, but I’m working with strings, and changing the schema is not an option.

Answer 1

Use:

UPDATE posts
   SET published = CASE 
                     WHEN published IS NULL THEN NULL
                     WHEN published = '1' THEN '0'
                     ELSE '1' 
                   END