MySQL - Can You Concatenate Strings From a Column Into a Single Row?
How would one concatenate strings from a column (multiple rows) into a single row using MySQL? I see its possible with MS SQL Server 2005 and above. Any incite into how to achieve this in MySQL would be much appreciated.
MS SQL Server 2005 - Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | SELECT Web_Account_ID, GroupNameConcat = REPLACE( ( SELECT Web_Account_Group_Name_ID AS [DATA()] FROM tblWebAccountGroup WAG WHERE WAG.Web_Account_ID = WA.Web_Account_ID ORDER BY Web_Account_Group_Name_ID FOR XML PATH ('') ), ' ', ',') FROM tblWebAccounts WA ORDER BY Web_Account_ID |
Query Results Example
Source: aspfaq.com - How do I concatenate strings from a column into a single row?
I think you might be looking for MySQL’s GROUP_CONCAT function:
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
Try using GROUP_CONCAT with subselects
SELECT Web_Account_ID,
GROUP_CONCAT(CAST WAG.Web_Account_Group_Name_ID as CHAR)) FROM
tblWebAccounts as WA LEFT JOIN
tblWebAccountGroup as WAG ON
WA.Web_Account_ID = WAG.Web_Account_ID
ORDER BY WA.Web_Account_ID
http://www.mysqlperformanceblog.com/2006/09/04/group_concat-useful-group-by-extension/
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
– may need a bigger size
– set group_concat_max_len := 1024;
SELECT Web_Account_ID,
group_concat(Web_Account_Group_Name_ID ORDER BY Web_Account_Group_Name_ID)
FROM
tblWebAccountGroup WAG
JOIN
tblWebAccounts WA ON
WAG.Web_Account_ID = WA.Web_Account_ID
GROUP BY Web_Account_ID
ORDER BY Web_Account_ID
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
Actually - you will need to specify which Web_Account_ID you want there..
So to be safe:
SELECT WA.Web_Account_ID,
group_concat(Web_Account_Group_Name_ID ORDER BY Web_Account_Group_Name_ID)
FROM
tblWebAccountGroup WAG
JOIN
tblWebAccounts WA ON
WAG.Web_Account_ID = WA.Web_Account_ID
GROUP BY WA.Web_Account_ID
ORDER BY WA.Web_Account_ID
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
Did you try GROUP_CONCAT?
http://dev.mysql.com/doc/refman/5.1/en/group-by-functions.html#function_group-concat
Giuseppe
Have you looked at group_concat() http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
Unless I missing something isny it just:
SELECT Web_Account_ID, GROUP_CONCAT(Web_Account_Group_Name_ID ORDER BY Web_Account_Group_Name_ID SEPERATOR ‘,’) as GroupNameConcat
FROM tblWebAccounts WA
INNER JOIN tblWebAccountGroup WAG
ON (WAG.Web_Account_ID = WA.Web_Account_ID)
GROUP BY Web_Account_ID;
.. untested
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
Use group_concat:
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
With the aggregate function GROUP_CONCAT(). Very easy.
You can concatenate multiple columns even, modify the delimiter, and specify ordering.
Check out http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
This should give you the results you are getting in MS SQL.
Couldn’t this be done easier with group by and group_concat?
SELECT Web_Account_ID, group_concat(Web_Account_Group_Name_ID)
FROM tblWebAccounts WA
INNER JOIN tblWebAccountGroup WAG using (Web_Account_ID)
group by Web_Account_ID
ORDER BY Web_Account_ID
sorry, didn’t notice that you are doing MSSQL there, I don’t know for sure if it has a comperable function. A quick google suggests it doesn’t
SELECT WA.Web_Account_ID, GROUP_CONCAT(Web_Account_Group_Name_ID ORDER BY Web_Account_Group_Name_ID ASC SEPARATOR “,”)) FROM
tblWebAccounts WA INNER JOIN tblWebAccountGroup WAG USING (Web_Account_ID)
GROUP BY WA.Web_Account_ID ORDER BY WA.Web_Account_ID
http://dev.mysql.com/doc/refman/5.0/fr/group-by-functions.html
Look for GROUP_CONCAT
“How would one concatenate strings from a column (multiple rows) into a single row using MySQL?”
SELECT
Web_Account_ID
, GROUP_CONCAT(
Web_Account_Group_Name_ID
ORDER BY Web_Account_Group_Name_ID
)
FROM tblWebAccountGroup WAG
INNER JOIN tblWebAccounts WA
USING (Web_Account_ID)
GROUP BY Web_Account_ID
So, GROUP_CONCAT is an ordinary aggregate function available since MySQL 4.1 (Released: 23 October 2004)
http://dev.mysql.com/doc/refman/5.1/en/group-by-functions.html#function_group-concat
I’m sure I’m not the only one posting this, but:
SELECT WA.Web_Account_ID, GROUP_CONCAT(WAG.Web_Account_Group_Name_ID)
FROM tblWebAccounts WA
INNER JOIN tblWebAccountGroup WAG ON WAG.Web_Account_ID = WA.Web_Account_ID
GROUP BY WA.Web_Account_ID
Actually you really only need to query the WAG table for this exact data, but the full query with the join allows you to then get at other information in the WA table if you want it.
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
Using GROUP_CONCAT, take a look at http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
Something like this should do it:
SELECT
Web_Account_ID,
GROUP_CONCAT(Web_Account_Group_Name_ID)
FROM
tblWebAccounts WA,
WAG
WHERE
WAG.Web_Account_ID = WA.Web_Account_ID
ORDER BY Web_Account_ID;
Hi,
You can use GROUP_CONCAT for this, see http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html for more information.
You might need a cast if you’re concating other datatypes than the regular string types.
Hi,
See GROUP_CONCAT().
Regards,
Jeremy
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
How about:
SELECT Web_Account_ID, GROUP_CONCAT(Web_Account_Group_Name_ID ORDER BY Web_Account_Group_Name_ID ASC SEPARATOR ‘,’) As GroupNameConcat
FROM tblWebAccounts JOIN tblWebAccountGroup USING Web_Account_ID
GROUP BY Web_Account_ID
ORDER BY Web_Account_ID
Use the GROUP_CONCAT() function
http://dev.mysql.com/doc/refman/4.1/en/group-by-functions.html#function_group-concat
mysql> create table t1 (f1 int, f2 int);
Query OK, 0 rows affected (0.08 sec)
mysql> insert into t1 values(1,1),(1,3),(4,2),(2,3),(2,1),(3,2),(4,4);
Query OK, 7 rows affected (0.00 sec)
Records: 7 Duplicates: 0 Warnings: 0
mysql> select f1, group_concat(f2) from t1 group by f1;
+——+——————+
| f1 | group_concat(f2) |
+——+——————+
| 1 | 1,3 |
| 2 | 3,1 |
| 3 | 2 |
| 4 | 2,4 |
+——+——————+
4 rows in set (0.03 sec)
Might group_concat() be what you’re looking for?
To do this in MySQL is even easier than your example code:
SELECT WA.Web_Account_ID
, GROUP_CONCAT(Web_Account_Group_Name_ID) as GroupNameConcat
FROM FROM tblWebAccounts WA
INNER JOIN tblWebAccountGroup WAG
ON WAG.Web_Account_ID = WA.Web_Account_ID
GROUP BY wa.web_account_id
The GROUP_CONCAT() function is documented here:
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
Hi,
Use GROUP_CONCAT(). Please see my two posts on the subject:
http://code.openark.org/blog/?p=246
and
http://code.openark.org/blog/?p=126
Regards,
Shlomi
Are you looking for something like the following?
SELECT
Web_Account_ID,
GROUP_CONCAT(
DISTINCT Web_Account_Group_Name_ID
ORDER BY Web_Account_Group_Name_ID
SEPARATOR ‘,’) AS GroupNameConcat
FROM tblWebAccounts WA
GROUP BY Web_Account_ID
ORDER BY Web_Account_ID;
More info on GROUP_CONCAT is available at http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
Check this link…
http://dev.mysql.com/doc/refman/4.1/en/group-by-functions.html#function_group-concat
Is there something wrong with the mysql group_concat function? http://dev.mysql.com/doc/refman/5.1/en/group-by-functions.html#function_group-concat
Mark
Hi Adam,
have you ever heard of GROUP_CONCAT?
SELECT Web_Account_ID,
GROUP_CONCAT(Web_Account_Group_Name_ID)
FROM tblWebAccounts AS WA
LEFT JOIN tblWebAccountGroup AS WAG
ON WAG.Web_Account_ID = WA.Web_Account_ID
GROUP BY WA.Web_Account_ID
ORDER BY WA.Web_Account_ID, WAG.Web_Account_Group_Name_ID
Greets,
Dennis
use the GROUP_CONCAT function
;o)
GROUP_CONCAT()
You can use the GROUP_CONCAT() function
SELECT WA.Web_Account_ID, GROUP_CONCAT(WAG.Web_Account_Group_Name_ID) /*Default is comma delimited but you can use different separators even return distinct values*/
FROM tblWebAccounts WA, tblWebAccountGroup WAG
WHERE WA.Web_Account_ID = WAG.Web_Account_ID /*Inner Join*/
GROUP BY WA.Web_Account_ID
ORDER BY Web_Account_ID
Please have a look on function GROUP_CONCAT() as described in section 11.12.1 of MySQL 5.1 Reference Manual.
Look up GROUP_CONCAT (and remember to set group_concat_max_len if you expect the result to exceed 512 characters.
http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html
GROUP_CONCAT
Thanks to everyone for the awesome feedback. I never expected such a huge response. You all definitely answered my question.
“I never expected such a huge response.”
heh
you would not have gotten such a huge response if you had moderated the first few replies that came in
when i posted (mine was #30) there were ~no~ previous comments visible
you gots to get more on da ball dan dat, adam
Just wanted to say thanks for posting this question and leaving all the feedback up! This helped me significantly.
Each photograph on my site has several descriptive attributes stored in a separate table (e.g. City, State) and linked by the photograph’s unique ID. While adding the ability to search to my site, it was no problem to search for Atlanta OR Georgia, but Atlanta AND Georgia wouldn’t work because only the first attribute field was being returned. Using GROUP_CONCAT to stuff all the attributes in the column into a field worked like a charm.