I have a value 'marks' in a pivot table, how to find student rank based on 'marks' value using query builder?
I have two models Exam and Student, after every student attempts an Exam that marks obtained by her/him is stored in the pivot table exam_user. I need to rank the student based on the marks obtained.
Right now I am using a very inefficient solution for this, which involves a for-loop. Below is the implementation
$rank=0;
$attempts = DB::table('exam_user')
->where('exam_id',$exam->id)
->orderBy('marks','desc')
->get();
foreach ($attempts as $attempt) {
$rank++;
if($attempt->user_id==Auth::id())
break;
}
Is there any way I can determine the rank without using a for loop, simply using the query builder in laravel. I think I am missing some SQL fundamentals here.
sql laravel laravel-5 php-7 laravel-query-builder
asked Nov 20 at 16:23
ravsourabh
86
add a comment |
I have two models Exam and Student, after every student attempts an Exam that marks obtained by her/him is stored in the pivot table exam_user. I need to rank the student based on the marks obtained.
Right now I am using a very inefficient solution for this, which involves a for-loop. Below is the implementation
$rank=0;
$attempts = DB::table('exam_user')
->where('exam_id',$exam->id)
->orderBy('marks','desc')
->get();
foreach ($attempts as $attempt) {
$rank++;
if($attempt->user_id==Auth::id())
break;
}
Is there any way I can determine the rank without using a for loop, simply using the query builder in laravel. I think I am missing some SQL fundamentals here.
sql laravel laravel-5 php-7 laravel-query-builder
asked Nov 20 at 16:23
ravsourabh
86
add a comment |
I have two models Exam and Student, after every student attempts an Exam that marks obtained by her/him is stored in the pivot table exam_user. I need to rank the student based on the marks obtained.
Right now I am using a very inefficient solution for this, which involves a for-loop. Below is the implementation
$rank=0;
$attempts = DB::table('exam_user')
->where('exam_id',$exam->id)
->orderBy('marks','desc')
->get();
foreach ($attempts as $attempt) {
$rank++;
if($attempt->user_id==Auth::id())
break;
}
Is there any way I can determine the rank without using a for loop, simply using the query builder in laravel. I think I am missing some SQL fundamentals here.
sql laravel laravel-5 php-7 laravel-query-builder
asked Nov 20 at 16:23
ravsourabh
86
I have two models Exam and Student, after every student attempts an Exam that marks obtained by her/him is stored in the pivot table exam_user. I need to rank the student based on the marks obtained.
Right now I am using a very inefficient solution for this, which involves a for-loop. Below is the implementation
$rank=0;
$attempts = DB::table('exam_user')
->where('exam_id',$exam->id)
->orderBy('marks','desc')
->get();
foreach ($attempts as $attempt) {
$rank++;
if($attempt->user_id==Auth::id())
break;
}
Is there any way I can determine the rank without using a for loop, simply using the query builder in laravel. I think I am missing some SQL fundamentals here.
sql laravel laravel-5 php-7 laravel-query-builder
sql laravel laravel-5 php-7 laravel-query-builder
asked Nov 20 at 16:23
ravsourabh
86
asked Nov 20 at 16:23
ravsourabh
86
asked Nov 20 at 16:23
ravsourabh
86
asked Nov 20 at 16:23
ravsourabh
86
asked Nov 20 at 16:23
ravsourabh
86
86
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Rank is just the number of people who has a greater value than yours + 1.
Therefore you can just do this:
$userMarks = DB::table('exam_user')
->select('marks')
->where('exam_id', $exam->id)
->where('user_id', '=', Auth::id())
->firstOrFail()
->marks;
$rank = DB::table('exam_user')
->where('exam_id', $exam->id)
->where('marks', '>', $userMarks)
->count() + 1;
You can also put this into one query:
$userId = Auth::id();
$rank = DB::table('exam_user')
->where('exam_id', $exam->id)
->whereRaw(
"marks > (select eu2.marks from exam_user eu2 where eu2.exam_id = {$exam->id} and eu2.user_id = {$userId}) limit 1"
)
->count() + 1;
You may also consider making you pivot table exam_user as an actual model, and call it something like Marks, as it contains important data that you would want to query.
You can then add the following to the Exam model:
Class Exam {
// ...
public function marks() {
$this->hasMany(Marks::class);
}
// ...
}
This means you could do something like:
$userId = Auth::id();
$rank = $exam->marks()
->whereRaw(
"marks > (select marks from exam_user where exam_id = {$exam->id} and user_id = {$userId}) limit 1"
)
->count() + 1;
answered Nov 20 at 16:44
Yahya Uddin
5,6581453107
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Rank is just the number of people who has a greater value than yours + 1.
Therefore you can just do this:
$userMarks = DB::table('exam_user')
->select('marks')
->where('exam_id', $exam->id)
->where('user_id', '=', Auth::id())
->firstOrFail()
->marks;
$rank = DB::table('exam_user')
->where('exam_id', $exam->id)
->where('marks', '>', $userMarks)
->count() + 1;
You can also put this into one query:
$userId = Auth::id();
$rank = DB::table('exam_user')
->where('exam_id', $exam->id)
->whereRaw(
"marks > (select eu2.marks from exam_user eu2 where eu2.exam_id = {$exam->id} and eu2.user_id = {$userId}) limit 1"
)
->count() + 1;
You may also consider making you pivot table exam_user as an actual model, and call it something like Marks, as it contains important data that you would want to query.
You can then add the following to the Exam model:
Class Exam {
// ...
public function marks() {
$this->hasMany(Marks::class);
}
// ...
}
This means you could do something like:
$userId = Auth::id();
$rank = $exam->marks()
->whereRaw(
"marks > (select marks from exam_user where exam_id = {$exam->id} and user_id = {$userId}) limit 1"
)
->count() + 1;
answered Nov 20 at 16:44
Yahya Uddin
5,6581453107
add a comment |
Rank is just the number of people who has a greater value than yours + 1.
Therefore you can just do this:
$userMarks = DB::table('exam_user')
->select('marks')
->where('exam_id', $exam->id)
->where('user_id', '=', Auth::id())
->firstOrFail()
->marks;
$rank = DB::table('exam_user')
->where('exam_id', $exam->id)
->where('marks', '>', $userMarks)
->count() + 1;
You can also put this into one query:
$userId = Auth::id();
$rank = DB::table('exam_user')
->where('exam_id', $exam->id)
->whereRaw(
"marks > (select eu2.marks from exam_user eu2 where eu2.exam_id = {$exam->id} and eu2.user_id = {$userId}) limit 1"
)
->count() + 1;
You may also consider making you pivot table exam_user as an actual model, and call it something like Marks, as it contains important data that you would want to query.
You can then add the following to the Exam model:
Class Exam {
// ...
public function marks() {
$this->hasMany(Marks::class);
}
// ...
}
This means you could do something like:
$userId = Auth::id();
$rank = $exam->marks()
->whereRaw(
"marks > (select marks from exam_user where exam_id = {$exam->id} and user_id = {$userId}) limit 1"
)
->count() + 1;
answered Nov 20 at 16:44
Yahya Uddin
5,6581453107
add a comment |
Rank is just the number of people who has a greater value than yours + 1.
Therefore you can just do this:
$userMarks = DB::table('exam_user')
->select('marks')
->where('exam_id', $exam->id)
->where('user_id', '=', Auth::id())
->firstOrFail()
->marks;
$rank = DB::table('exam_user')
->where('exam_id', $exam->id)
->where('marks', '>', $userMarks)
->count() + 1;
You can also put this into one query:
$userId = Auth::id();
$rank = DB::table('exam_user')
->where('exam_id', $exam->id)
->whereRaw(
"marks > (select eu2.marks from exam_user eu2 where eu2.exam_id = {$exam->id} and eu2.user_id = {$userId}) limit 1"
)
->count() + 1;
You may also consider making you pivot table exam_user as an actual model, and call it something like Marks, as it contains important data that you would want to query.
You can then add the following to the Exam model:
Class Exam {
// ...
public function marks() {
$this->hasMany(Marks::class);
}
// ...
}
This means you could do something like:
$userId = Auth::id();
$rank = $exam->marks()
->whereRaw(
"marks > (select marks from exam_user where exam_id = {$exam->id} and user_id = {$userId}) limit 1"
)
->count() + 1;
answered Nov 20 at 16:44
Yahya Uddin
5,6581453107
Rank is just the number of people who has a greater value than yours + 1.
Therefore you can just do this:
$userMarks = DB::table('exam_user')
->select('marks')
->where('exam_id', $exam->id)
->where('user_id', '=', Auth::id())
->firstOrFail()
->marks;
$rank = DB::table('exam_user')
->where('exam_id', $exam->id)
->where('marks', '>', $userMarks)
->count() + 1;
You can also put this into one query:
$userId = Auth::id();
$rank = DB::table('exam_user')
->where('exam_id', $exam->id)
->whereRaw(
"marks > (select eu2.marks from exam_user eu2 where eu2.exam_id = {$exam->id} and eu2.user_id = {$userId}) limit 1"
)
->count() + 1;
You may also consider making you pivot table exam_user as an actual model, and call it something like Marks, as it contains important data that you would want to query.
You can then add the following to the Exam model:
Class Exam {
// ...
public function marks() {
$this->hasMany(Marks::class);
}
// ...
}
This means you could do something like:
$userId = Auth::id();
$rank = $exam->marks()
->whereRaw(
"marks > (select marks from exam_user where exam_id = {$exam->id} and user_id = {$userId}) limit 1"
)
->count() + 1;
answered Nov 20 at 16:44
Yahya Uddin
5,6581453107
edited Nov 20 at 23:39
answered Nov 20 at 16:44
Yahya Uddin
5,6581453107
answered Nov 20 at 16:44
Yahya Uddin
5,6581453107
answered Nov 20 at 16:44
Yahya Uddin
5,6581453107
5,6581453107
add a comment |
add a comment |
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