Count milestone By Id in Mysql Query - php

Question

table milestoneeventI have three tables file and milestone event. I want to count milestones but by Company.
For example, if I want to count number of last milestone added for the milestone id=1, I do this:
select count('id') as st
from (
select idfile,
max(idmilestone) as max_idmilestone
from milestoneevent
group by idfile)
d where max_idmilestone =1
my problem is how to count them but for each company in table file I have column company. See the picture for more details

Answer 1

Statement should look like this
SELECT d.Comp,count(*),d.max_idmilestone FROM (
SELECT Comp, max(idmilestone) as max_idmilestone, count(idmilestone) as number FROM milestoneevent
INNER JOIN file ON file.id = idfile
GROUP BY idfile, Comp
) d GROUP BY d.max_idmilestone, d.Comp
In the subquery it give you the max(idmilestone) for every company but only if one milestone exists for a idfile, than count how many a max_idmilestone is occuring.
The Result of my test is
+-----------+----------+---+
| Comp | count(*) | |
+-----------+----------+---+
| Microsoft | 5 | 1 |
| Oracle | 1 | 1 |
| Microsoft | 2 | 2 |
| Oracle | 1 | 2 |
+-----------+----------+---+
**Query for Company or milestoneid
If you want to query for Company or max_idmilestone just do this
SELECT d.Comp,count(*),d.max_idmilestone FROM (
SELECT Comp, max(idmilestone) as max_idmilestone, count(idmilestone) as number FROM milestoneevent
INNER JOIN file ON file.id = idfile
WHERE Comp = "Microsoft"
GROUP BY idfile, Comp
) d
WHERE d.max_idmilestone = 1
GROUP BY d.max_idmilestone, d.Comp
Output
+-----------+----------+---+
| Comp | count(*) | |
+-----------+----------+---+
| Microsoft | 5 | 1 |
+-----------+----------+---+
For My Test I used the following structure. Skipped some columns which are not necessary for the test
CREATE TABLE `milestoneevent` (
`id` INT(22) NOT NULL auto_increment,
`idfile` INT(64) NOT NULL,
`idmilestone` INT(64) NOT NULL,
`company` VARCHAR(64) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `file` (
`id` int(22) NOT NULL AUTO_INCREMENT,
`Comp` varchar(64) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8;
Data of the test
+----+--------+-------------+
| id | idfile | idmilestone |
+----+--------+-------------+
| 1 | 1 | 1 |
| 2 | 10 | 1 |
| 3 | 11 | 1 |
| 4 | 12 | 1 |
| 5 | 13 | 1 |
| 6 | 14 | 1 |
| 7 | 15 | 1 |
| 8 | 16 | 2 |
| 9 | 14 | 2 |
| 10 | 18 | 2 |
+----+--------+-------------+
+----+-----------+
| id | Comp |
+----+-----------+
| 1 | Microsoft |
| 10 | Microsoft |
| 11 | Microsoft |
| 12 | Microsoft |
| 13 | Microsoft |
| 14 | Microsoft |
| 15 | Oracle |
| 16 | Oracle |
| 18 | Microsoft |
+----+-----------+