How to GROUP GROUP_CONCAT()? - php

Question

I am looking for a way to get groups of the GROUP_CONCAT() function in a single query, for example.
My current code
SELECT
SUBSTRING_INDEX(GROUP_CONCAT(service_info.ip_address SEPARATOR ','),',',service_plans.aggregation) AS ip_address
FROM
services
LEFT JOIN
service_info
ON
service_info.service_id = services.id
LEFT JOIN
service_plans
ON
service_plans.id = services.service_plan_id
WHERE
service_plans.id = '2'
I want to group the IP addresses by a specific number(the $group_by variable if you see in the query) but then separate by a different character such as ":" or something.
Essentially I want my output to look like:
If $group_by=2: 10.1.1.2,10.1.1.3:10.1.1.4,10.1.1.5
If $group_by=3: 10.1.1.2,10.1.1.3,10.1.1.4:10.1.1.5
Is this possible to implement into my current query?
UPDATE: table structure
Table service_plans
id | name | aggregation
-----------------------------------------
1 | Uncapped 10Mbps 20:1 | 20
2 | Uncapped 20Mbps 10:1 | 10
3 | Capped 30Mbps | 0
Table services
id | service_plan_id | description
------------------------------------
1 | 2 | Phone
2 | 2 | Laptop
3 | 2 | PC
4 | 2 | TV
5 | 2 | Test
Table service_info
id | service_id | ip_address
------------------------------
1 | 1 | 10.1.1.2
2 | 2 | 10.1.1.3
3 | 3 | 10.1.1.4
4 | 4 | 10.1.1.5
5 | 5 | 10.1.1.6
I am trying to get an array of ip_address's concatenated and separated by a comma but the in groups of however much the service_plans.aggregation value is.
If aggregation is 2, then my output should be:
10.1.1.2,10.1.1.3:10.1.1.4,10.1.1.5
As you can see they are in groups of 2 and then the next group is separated by a colon(:)
If aggregation is 3, then my output should be:
10.1.1.2,10.1.1.3,10.1.1.4:10.1.1.5
As you can see they are in groups of 3 and then the next group is separated by a colon(:) and so on

Answer 1

Your post is a little confusing. What would be helpful is if you posted sample data, and then posted what you want your query to return. I'll give you an answer to what I think you're asking, based on the subject of your post.
ServicePlanIPs
service_plan_id | ip_address
-------------------------------
1 | 192.168.70.1
1 | 192.168.70.2
1 | 192.168.70.3
2 | 192.168.70.4
2 | 192.168.70.5
2 | 192.168.70.6
If you run this query against ServicePlanIPs:
SELECT service_plan_id, GROUP_CONCAT(ip_address) as ip_addresses
FROM ServicePlanIPs
GROUP BY service_plan_id
You will get:
service_plan_id | ip_addresses
-------------------------------
1 | 192.168.70.1, 192.168.70.2, 192.168.70.3
2 | 192.168.70.4, 192.168.70.5, 192.168.70.6

Answer 2

I don't guarantee this will run out of the box, but it should get you on the right track. Hope it helps. Note - if you're using a version of mysql which supports window functions, you can do something similar to the below and use the natively supported RANK function instead of doing it manually with variables.
SET #curRank := 0;
SET #concatIps := '';
SELECT
sp.id,
#curRank := #curRank + 1 AS rank,
IF(MOD(#curRank, (SELECT aggregation FROM service_plans WHERE id = {service_plan_id}) = 0, #concatIps := CONCAT(#concatIps, ':', s.ip_address), #concatIps := CONCAT(#concatIps, ',', s.ip_address))
FROM service_plans sp
JOIN services s
ON sp.id = s.service_plan_id
JOIN service_info si
ON si.service_id = s.id
WHERE sp.id = {service_plan_id}
ORDER BY service_info_id