MySQL sum calculation with multiple groups and subgroups - mysql

Question

I have a query which does not output the result I want. I spent several days on this, but I did not find a solution.
My Code
SELECT *, IFNULL(type, 'N/A') AS groupField, IFNULL(type, 'N/A') AS displayField, `pmonth`, `pyear`, count(prj.code) as projects_num
FROM `tblProjecats` `prj`
LEFT JOIN ( select cda, pyear, pmonth, sum(venituri) venituri, sum(cheltuieli) cheltuieli, sum(if(cont3 between 500 and 550,cheltuieli,0)) cheltuieliD, sum(if(cont3 > 550,cheltuieli,0)) cheltuieliI from buffer_cda group by pyear, pmonth, cda ) cda ON `cda`.`cda`=`prj`.`code`
-- more simple left jons --
WHERE (concat(pyear,lpad(pmonth,2,0)) BETWEEN 201811 AND 201911)
GROUP BY `type`, concat_ws('', `cda`.`pyear`, lpad(cda.pmonth, 2, '0'))
ORDER BY `type` ASC, `pyear` ASC, `pmonth` ASC, `cda` ASC
Table tblProjects
code type
66666 N/A
66667 Custom
66668 Simple
66669 Simple
66610 N/A
66611 Custom
66612 N/A
Table buffer_cda (with project Type joined for easier visualization)
cda pmonth pyear type cheltuieliD
66666 1 2019 N/A 1
66667 1 2019 Custom 10
66668 1 2019 Simple 100
66669 12 2018 Simple 200
66610 12 2018 N/A 2
66611 12 2018 Custom 20
66612 12 2018 N/A 3
66612 12 2018 N/A 4
Expected result
Type pmonth pyear count_prj cheltuieliD
N/A 12 2018 2 9
N/A 1 2019 1 1
Custom 12 2018 1 20
Custom 1 2019 1 10
Simple 12 2018 1 200
Simple 1 2019 1 100
Actual result
Type pmonth pyear count_prj cheltuieliD
N/A 12 2018 2 7
N/A 1 2019 8 1
Custom 12 2018 1 20
Custom 1 2019 3 10
Simple 12 2018 1 200
Simple 1 2019 1 100
I am doing something wrong with groupings but I do not know what. In other cases I have a duplicate Type results with cheltuieliD= 2 and cheltuieliD= 7 (instead of one type with cheltuieliD=9)
Next step on this would be calculating the cheltuieliD indicator on each project type, on Period Groups (month/Year) and then a grand total. Is this possible with a single query?

Answer 1

Chnge your groupby sequence with cda, pyear, pmonth...
If you just want to return project count every month then remove cda frim groupby clause...
If you could explain what logical operation you want to perform we can help.

Answer 2

Your data does not seem to be representative of your problem but given the sample data provided I would code like this
drop table if exists tblprojects,buffer_cda;
create table tblProjects
(code int, type varchar(20));
insert into tblprojects values
(66666 , 'N/A'),
(66667 , 'Custom'),
(66668 , 'Simple'),
(66669 , 'Simple'),
(66610 , 'N/A'),
(66611 , 'Custom'),
(66612 , 'N/A');
create Table buffer_cda
(cda int,pmonth int, pyear int, cheltuieliD int);
insert into buffer_cda values
(66666 , 1 ,2019 , 1),
(66667 , 1 ,2019 , 10),
(66668 , 1 ,2019 , 100),
(66669 , 12 ,2018 , 200),
(66610 , 12 ,2018 , 2),
(66611 , 12 ,2018 , 20),
(66612 , 12 ,2018 , 3),
(66612 , 12 ,2018 , 4);
select type,pmonth,pyear,count(type),sum(cheltuieliD)
from tblprojects tp
join buffer_cda bc on bc.cda = tp.code
group by type,pyear,pmonth;
+--------+--------+-------+-------------+------------------+
| type | pmonth | pyear | count(type) | sum(cheltuieliD) |
+--------+--------+-------+-------------+------------------+
| Custom | 12 | 2018 | 1 | 20 |
| Custom | 1 | 2019 | 1 | 10 |
| N/A | 12 | 2018 | 3 | 9 |
| N/A | 1 | 2019 | 1 | 1 |
| Simple | 12 | 2018 | 1 | 200 |
| Simple | 1 | 2019 | 1 | 100 |
+--------+--------+-------+-------------+------------------+

Answer 3

I found the correct way!
Thank you all for your responses!
I had to swap joining buffer_cda on projects to projects joining to buffer_cda.
More on, I had to eliminate other joins.
Bellow my answer, written for codeigniter!
$this->db->select("*,IFNULL(".$groupField.", 'N/A') AS groupField, IFNULL(".$displayField.", 'N/A') AS displayField, luna,anul,
count(DISTINCT prj.code) as projects_num,
sum(if(cont3 between 500 and 550,cheltuieli,0)) AS cheltuieliD,
sum(if(cont3 > 550,cheltuieli,0)) cheltuieliI,
sum(if(cont3 between 500 and 550,cheltuieli,0))/count(DISTINCT prj.code) AS cheltuieliDAvg,
sum(if(cont3 > 550,cheltuieli,0))/count(DISTINCT prj.code) cheltuieliIAvg
");
$this->db->from('buffer_cda cda');
$this->db->join('(
select * from tblProjects ) prj', 'cda.cda=prj.code', 'LEFT');
I also grouped by type, pyear, pmonth.