Question

I have categories table:

cat_id
cat_name

Than categories – posts relationship table cat_rel:

cat_rel_id
cat_id
post_id

And posts table:

post_id
post_title
post_content

Now I have data in all these tables, I need to pull out categories without to repeat those that have more than 1 post. I get somehow category repeated if it has more than 1 post, eg. categories like:

php, python, c++, java, ruby

if I have 2 posts under PHP, I will get:

php
python
php
java

and this is the query I run:

SELECT categories.cat_name, cat_rel.post_id 
FROM categories 
LEFT JOIN cat_rel ON cat_rel.cat_ID = categories.cat_ID

Any help about making those categories not to repeat, would be appreciated

Answer 1

Use DISTINCT

Have a look here:
SQL SELECT DISTINCT Statement