SQL select based on multiple rows values

Question

Here is an image attached for a mini-blog I am designing for a small site. I would like to make a SQL Select statement where I get blog id for blogs where its status = '1' and its categories LIKE '%blog%' . How do I make a single SQL call where I get all active blogs that has "blog" in its category?

Answer 1

Here is one method:

select b.blog_id
from blogs b
where (b.field = 'status' and b.data = '1') or
      (b.field = 'categories' and b.data LIKE '%blog%')
group by b.blog_id
having count(*) = 2;

This assumes that "status" and "categories" only appear once. Otherwise, you need:

having count(distinct field) = 2