Querying sum of multiple aggregate columns (without groupBy) - php

Question

I have a transactions table and I'm trying to get the total of each type.
To simply put it looks like this
id
type
credit_movement
1
top_up
10000
2
fee
-50
3
deduct
-1000
I am trying to get sum of each type to show as a report.
top_up: 10000
fee: 50
deduct: 1000
net_expense: 9850 [top_up - deduct - fee]
$types = [
'top_up' => ['top_up'],
'deduct' => ['deduct'],
'fee' => ['fee'],
'net_expense' => ['top_up', 'deduct', 'fee'],
];
$query = DB::table('transactions');
foreach ($types as $type => $fields) {
$query->selectSub(function ($query) use ($fields) {
return $query->selectRaw('SUM(credit_movement)')->whereIn('type', $fields);
}, $type);
};
$results = $query->get();
When I do this, I get:
1140 In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'project.transactions.type'; this is incompatible with sql_mode=only_full_group_by..
When I change my database.mysql.strict = false, it works; however I want to make it work properly without needing to change the mysql config.
As of my understanding, this error indicates that I am only selecting aggregated columns, but in my case I don't actually want to groupBy() anything as this is just reports.
If I try to groupBy('type') it returns everything grouped by type, but the queries are only run within that group.
{
0: {
top_up: 10000,
deduct: 0,
fee: 0,
net_expense: 10000
}
1: {
top_up: 0,
deduct: -1000,
fee: 0,
net_expense: -1000
},
// etc...
}
Is there a way to obtain without changing strict to false?
{
0 => {
top_up: 10000,
deduct: -1000,
fee: -50,
net_expense: 9850
}
}

Answer 1

If I understand you correctly this might be very easy but again I might have not understood it right.
$result = DB::table('transactions')->selectRaw('type, SUM(credit_movement) as sum')->groupBy('status')->get();
This should return something like this:
type
sum
fee
-5656
topup
8758
deduct
-7625
For the total sum you can just do it in php which would make it easier
$net = $result->sum('sum'); // equals -5656+8758-7625
Hope this helps and let me know if I am wrong about it.

Answer 2

The problem with your approach is in the final column that is the sum of the other 3 so you can't use SUM because you don't have a column to group.
You could use a subquery but I think that the best solution is to add a little elaboration of the raw data that you get from a simpler query.
$query = DB::table('transactions')
->selectRaw('type, SUM(credit_movement) AS movements')
->groupBy('type');
$results = array_reduce($query->get(), function(array $res, array $value){
$res[$array['type']] = $array['movements'];
return $res;
}, []);
$results['net_expense'] = array_sum($results);