Question

i need help in sql query

i have table named — threads

contain

post_id / post_title …..

and i have categories table named

thread_categories

contain

cate_id / post_id

file.php?cate_id=20

i want get all posts in category id = 20

Thank you

Answer 1

I think it’s better to store your categories which is related to threads in a separate table.
Otherwise your query will very slow and inefficient.

You can use current table structure and try to use the following query but I don’t like it:

SELECT * FROM posts 
WHERE FIND_IN_SET(provided_cat_id,REPLACE(thread_categories, '::', ','));

New query:

SELECT * FROM threads t inner join thread_categories tc on t.post_id=tc.post_id
where tc.cate_id=20;