Grouping MySQL Data and Formatting with PHP and CSS - php

Question

FYI, I am using PHP and MySQL.
I am working on converting our spreadsheet staff rota to a more interactive online rota system.
I can get all the functions of the rota system fine, but when it comes to formatting it to make it clear of the departments and roles within each department, it is not so obvious.
I dont want to have to create a call to the database for each department and each role within the departments, but am stumped as to how to it to group the results and then output the results correctly and with the formatting I would like.
I do understand that this may be a very vague explanation of what I am trying to get to happen, and feel free to ask as many questions as you like.
I hope I make sense :-)
Have a great day
MySQL Data
ID | Name | Dept | Role
---|--------|------|------
1 | John | 1 | 2
2 | Steve | 1 | 2
3 | Colin | 1 | 3
4 | Trevor | 1 | 3
5 | Nigel | 2 | 4
6 | Gary | 2 | 5
Desire page/table format
STAFF | ..
-------|---
John | ..
Steve | ..
-------|---
Colin | ..
Trevor | ..
-------|---
TOT D1 | ..
-------|---
Nigel | ..
-------|---
Gary | ..
-------|---
TOT D2 | ..

Answer 1

If you want to get the values for each employee and the sum by department you can use the WITH ROLLUP modifier of the GROUP BY clause with adds extra rows with the totals by each value of the grouped columns.
Supposing that you want to show the salary:
select coalesce(name,concat('Total D',Dept)) as Name, sum(Salary) as Salary
from Staff
group by Dept, name with rollup
having coalesce(Dept,0)!=0
Results:
| Name | Salary |
|----------|--------|
| Colin | 80000 |
| John | 100000 |
| Steve | 120000 |
| Trevor | 40000 |
| Total D1 | 340000 |
| Gary | 60000 |
| Nigel | 50000 |
| Total D2 | 110000 |
The HAVING condition if for excluding the final row with the grand total, if you want that row you have to change a bit the COALESCE() to get the proper description:
select coalesce(name,concat('Total D',Dept),'Grand total') as Name, sum(Salary) as Salary
from Staff
group by Dept, name with rollup
Results:
| Name | Salary |
|-------------|--------|
| Colin | 80000 |
| John | 100000 |
| Steve | 120000 |
| Trevor | 40000 |
| Total D1 | 340000 |
| Gary | 60000 |
| Nigel | 50000 |
| Total D2 | 110000 |
| Grand total | 450000 |