How to add a count column of each returned row from another table?

Question

0.00/5 (No votes)

See more:

Could anyone please show me an example of how to add a new counted column of each returned row of a referenced column from another table.

The below example is what I'm more or less looking for (doesn't work).

<pre lang="sql">SELECT
e.id,
e.video_id,
SELECT count(r.id) FROM reported as r where r.embed_id = e.id as countedItems
FROM videostreamer.embed e;

Result...
e.ID e.Video_ID countedItems
1.....20...........0
2.....22...........2
3.....23...........9
4.....25...........0

Posted 10-Mar-10 5:41am

Serenity1

Updated 10-Mar-10 5:42am

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Serenity1 · Answer 1 · 2010-03-11T07:01:00

I eventually did it by adding a Function (if anyone would like to)...

<pre lang="sql">DELIMITER $$
DROP FUNCTION IF EXISTS `videostreamer`.`countReported` $$
CREATE FUNCTION `videostreamer`.`countReported` (aembed_ID int) RETURNS INTEGER
BEGIN

  DECLARE Temp INTEGER;
  SELECT count(id) INTO Temp FROM reported where embed_id = aembed_ID;
  RETURN IFNULL(Temp, 0);

END $$
DELIMITER ;

Then the sql was....

SELECT *, countReported(e.id) cReported  
FROM embed e 
where e.video_id = 368 and e.enabled = 1 and e.Parent_ID = 0 order by cReported;

DaveAuld · Answer 2 · 2010-03-10T07:34:00

Solution 1

SQL

SELECT    e.id, e.video_id, COUNT(r.embed_id) AS Count
FROM      reported AS r 
INNER JOIN
          [videostreamer.embed] AS e 
ON        r.embed_id = e.video_id

Posted 10-Mar-10 7:34am

DaveAuld

Updated 10-Mar-10 8:10am

v2