Comments on: GROUP_CONCAT useful GROUP BY extension

By: Ron

Ron — Sun, 25 Dec 2011 19:19:02 +0000

I have a table like
userid testid attempts grade
2 1 6,4,9,2,7,5,3,8,1 20,55,56,67,80,66,33,34,52

I want to get the attempts in order like
userid testid attempts grade
2 1 1,2,3,4,5,6,7,8,9 52,67,33,55,66,20,80,34,56
And my query looks like
SELECT li.userid, li.testid, group_concat(li.attempts AS att, group_concat(li.grade) FROM testattempts GROUP BY testid

Could anyone help me with this?

By: mohammed

mohammed — Tue, 01 Nov 2011 17:24:00 +0000

Thank you , Vadim Tkachenko
i used group_concat in my query but i got i problem
problem is

mysql group_concat limit length is 1024 and i need to increase it ( i did it )

(
but is there is problem when i increase group_concat length to more than 1024
)

it work fine in localhost , but on the website , i got error -> need more premission to do this

By: Panagiotis

Panagiotis — Mon, 19 Sep 2011 06:41:53 +0000

Hi, this is a useful tutorial but i need some more help. In my table the column I use the GROUP_CONCAT is a foreign key from another table. So, i have to display PC1,PC2,PC3 for example and no 2,3,4 which are the values of my table. I tried with LEFT JOIN but I didn’t get a result. I’m trying to make an extra query inorder to take those names but nothing yet. Can you halp me a little bit?

By: Herah

Herah — Sun, 14 Aug 2011 14:29:05 +0000

Thank you! this really helped alot!

By: van

van — Wed, 27 Jul 2011 18:33:57 +0000

@Barbara,

thanks

By: maxi

maxi — Mon, 04 Apr 2011 14:42:14 +0000

@bhushan .. thank you that resolved a query with bigint values!

By: bhushan

bhushan — Thu, 18 Feb 2010 09:40:38 +0000

thank bosss “@Murz, Jasan ”

it work for me..

@Murz, Jasan

Alternatively you can use

CONVERT(group_concat(myInt) USING utf8)

By: liki05

liki05 — Wed, 11 Nov 2009 07:47:19 +0000

hi PixelMe.

you can use substring_index(group_concat(column),’,',2). it will return the first 2 concated values.

By: FunciÃ³n GROUP_CONCAT de MySQL | Otro Blog MÃ¡s

FunciÃ³n GROUP_CONCAT de MySQL | Otro Blog MÃ¡s — Mon, 19 Oct 2009 20:06:31 +0000

[...] – Syntax Error y MySQL Performance Blog (mirar tambiÃ©n los comentarios) Share this on del.icio.usShare this on [...]

By: PixelMe

PixelMe — Wed, 13 May 2009 19:05:18 +0000

When I am using in GROUP_CONCAT, It will list all the values associated wit the parent ID, But I need only few like limit in ordinary SQL statement. Anybody know how to do this in MySQL qeury?

tblmovies
MovieId MovieName
1 The Take
2 Fatal Contact
3 Flashbacks of a Fool
4 Teddy Bear
5 Nanking

tblgenres
GenreId GenreName
1 Action
2 Horror
3 Sci-Fi
4 Documentary
5 Drama
6 History

tblmovie_genres
movieId GenreId
1 2
1 4
1 5
2 4
4 5
3 5
5 6

When I was selecting the Movie whith Id 1 GROUP_CONCAT will result Horror,Documentary, Drama ; But I want to get only 2 genres which is Horror,Documentary.

Please somebody help me .

Thanks.