Rows to columns in MySQL without knowing the rows in advance - mysql

Question

I have a MySQL table that looks like this:
+---------+-------------+--------------+-------------+-------------+
| truckNo | excavatorId | times_loaded | litres | litres/time |
+---------+-------------+--------------+-------------+-------------+
| 1 | 345 | 100 | 50 | 0.5 |
+---------+-------------+--------------+-------------+-------------+
| 1 | 275 | 34 | 50 | 1.47 |
+---------+-------------+--------------+-------------+-------------+
| 2 | 275 | 100 | 50 | 0.5 |
+---------+-------------+--------------+-------------+-------------+
In this table, an Excavator loads to any truck one or more times. For example Excavator 345 loaded some material on truck 1 100 times. But Truck 1 was also loaded by excavator 275 some material 34 times. Now I want to group the results per truck, so in the left column I can see the distinct truck and have each excavator as a new column as in the following table:
+--------+---------------------------------+---------------+--------------+
| Truck | Excavators | Total_loads | Total litres | Litres/load |
+--------+-----------+-------+-------------+---------------+--------------+
| | 345 | 275 | | | |
+--------+-----------+-------+-------------+---------------+--------------+
| 1 | 100 | 34 | 134 | 1.95 | 0.01 |
+--------+-----------+-------+-------------+---------------+--------------+
| 2 | | 50 | 50 | 50 | 1 |
+--------+-----------+-------+-------------+---------------+--------------+
The problem is that I never know in advance how many excavators will there be in the table so I know how many columns to make.
Is there any way to do that ? Is it possible is SQL ?
EDIT: Each truck is loaded one or more times by any excavator. So in the result table for example truck no 1 was loaded 100 times by Excavator 345 and 34 times by excavator 275. In total loads you see all loads that were upon truck 1, from all/any excavator which is 134. Same for liters. The litres/load is the division in the result table of Total litres / Total_loads

Answer 1

SQL queries always generate result tables with the columns stated. If you don't know the columns you want to show, you cannot write the query.
Your options:
Select the raw data and construct the result table from that data in your app or Website.
Select the excavators first. Then use your programming language to create a query particularly for those excavators.
Do with one column containing concatenated strings.
Here is #3:
select
truckno,
group_concat('EX(', excavatorid, ')=', times_loaded order by excavatorid) as loads,
sum(times_loaded) as total_loads,
sum(litres) as total_litres,
sum(litres) / sum(times_loaded) as litres_per_load
group by truckno
order by truckno;