How do I count multiple columns with a vertical value? - mysql

Question

I'm new to programing. I have table
check_1,check_2,check_3 ..etc
------------------------------
1 1 1
0 0 1
1 0 1
And I want this output :
column_name, count_true
-----------------------
check_1 2
check_2 1
check_3 3
I've tried it with mysql using the union function, but when I try to apply it in laravel I have trouble with union. Is there a unionless query that can produce such output?
Thanks in advance

Answer 1

You can do this way. One query in db
$records = DB::table('your_table')->get();
$check1Count = $records->where('check_1', 1)->count();
$check2Count = $records->where('check_2', 1)->count();
$check3Count = $records->where('check_3', 1)->count();
......
Or
$records = DB::table('your_table')->get();
$columns = ['check_1', 'check_2', 'check_3', ...];
$data = [];
foreach($columns as $column) {
$data[] = [
'column_name' => $column,
'count_true' => $records->where($column, 1)->count();
];
}
Also you can do this way but it is many query
$check1Count = DB::table('your_table')
->selectRaw('COUNT(check_1) as count')
->where('check_1', 1)
->first()
->count;
$check2Count = DB::table('your_table')
->selectRaw('COUNT(check_2) as count')
->where('check_2', 1)
->first()
->count;
.....

Answer 2

A normalised approach might look like this:
response_id checkbox
1 1
1 2
1 3
2 3
3 1
3 3

Answer 3

You don't need union, just query all the data and process it on Laravel. Let say you query all the data using eloquent to $data variable, then you should do it like this:
//preparing a variable to hold all 24 database field value
$total = [];
foreach ($data as $d) {
//do this for all 24 database field
if ($d->check_1) {
$total[1]++;
}
if ($d->check_2) {
$total[2]++;
}
...
}
By using that way you can't check the resutl on $total[index] variable. And yes, there is a better way to store your data instead of saving all the field for each user. You can just store all checked value in database that look like this :
user_id checkbox_id
1 3
1 5
1 9
1 24
2 23
3 2
3 3
It more efficient since you don't need to save the unchecked checkbox value, if they more likely not to checked most of the checkbox.