fetch multiple tables in one query

Question

This is thirty post in one houre . so i am sorry !

but i did\'t get what i want !

i will try to explain more ..

i have two tables ..

POSTS <--

Answer 1

Your question is super ambiguous, so I will do my best:

SELECT * FROM posts LEFT JOIN comments ON posts.post_id = comments.post_id

That is the query you want (same that you have, but * instead of "posts.,comments.".

This will, of course, retrieve all the rows in Posts, even if they don't have any comments. You need to do:

SELECT * FROM posts LEFT JOIN comments ON posts.post_id = comments.post_id WHERE posts.post_id= = 

to get only a specific post's comments. Of course, that would be silly since it would be the same thing as just doing:

SELECT * FROM comments WHERE post_id = 

If you want to only select rows in Posts that have comments, you must do:

SELECT * FROM posts INNER JOIN comments ON posts.post_id = comments.post_id

Or

SELECT * FROM posts NATURAL JOIN comments

(they have the same effect)