Question

My question is similar to this one, which I’ve tried the solution to, but it wasn’t exactly right for my scenario.

I have 2 tables: votes and posts. Here is a basic sketch:

`posts`
----+------------------------------------------------------------------------+
| ID | post_title                                                            |
+----+-----------------------------------------------------------------------+
|  1 | Hello world.                                                          |
|  2 | This is a post!                                                       |
|  3 | What is the meaning of life?                                          |
|  4 | Looking for a good time?                                              |
+----+-----------------------------------------------------------------------

`votes`
+----+---------+
| ID | post_id | 
+----+---------+
|  1 |     1   |  
|  2 |     1   | 
|  3 |     1   |  
|  4 |     3   | 
|  5 |     3   |  
|  6 |     4   |  
+----+---------+

Problem:

I want to know how many votes each post got, and display them so that the post with the highest vote is at the top.

     Post ID   Vote Count
   +---------+-----------+
   | 1       | 3         |
   | 3       | 2         |
   | 4       | 1         |
   | 2       | 0         |

What does the SQL query look like to achieve this goal?

Answer 1

select post_id, count(*)
from votes
group by post_id
order by count(*) desc

EDIT:

select v.post_id, count(*)
from votes v INNER JOIN posts p ON v.post_id = p.id
group by v.post_id
order by count(*) desc