Concatenate several fields into one with SQL

Question

I have three tables tag, page, pagetag

With the data below

page

ID      NAME
1           


        

Answer 1

I got a solution playing with joins. The query is:

SELECT
    page.id AS id,
    page.name AS name,
    tagstable.tags AS tags
FROM page 
LEFT OUTER JOIN 
(
    SELECT pagetag.pageid, GROUP_CONCAT(distinct tag.name) AS tags
    FROM tag INNER JOIN pagetag ON tagid = tag.id
    GROUP BY pagetag.pageid
)
AS tagstable ON tagstable.pageid = page.id
GROUP BY page.id

And this will be the output:

id   name    tags
---------------------------
1    page 1  tag2,tag3,tag1
2    page 2  tag1,tag3
3    page 3  tag4
4    page 4  NULL

Is it possible to boost the query speed writing it another way?