Using Union All and Order By in MySQL

Question

I\'ve 2 tables:

create table advertised_products(id int,title varchar(99),timestamp timestamp);
insert advertised_products select 1,\'t1\',curdate();

create         


        

Answer 1

Wrap it in a subquery.

SELECT s.*
FROM
    (
        SELECT  ap.*, 'advertised'  as type 
        FROM advertised_products as ap
          union all
        SELECT  wp.*, 'wanted' as type 
        FROM wanted_products as wp
    ) s
ORDER BY s.timestamp desc 
limit 3