C#•3y ago

I need help with understanding the flow of LINQ query expressions

Hello, i'm starting to learn the LINQ language and i don't know if i got my understanding of the process of executing right. My "theory" on example below from official Microsoft documentation is this:

It splits students into a row of student
It groups every student by the Year property into studentGroups

It Selects new Anonymous type with Level and HighScore of the group
I'm sorry if i messed it up but thats the reason why I'm even creating this post.
My theory number two is that everything under from except select and let applies directly to from. I couldn't find which one of these theories is right if even any of them is :D

var queryGroupMax =
 from student in students
 group student by student.Year into studentGroup
 select new
 {
     Level = studentGroup.Key,
     HighestScore = (
         from student2 in studentGroup
         select student2.ExamScores.Average()
     ).Max()
 };

var queryGroupMax =
 from student in students
 group student by student.Year into studentGroup
 select new
 {
     Level = studentGroup.Key,
     HighestScore = (
         from student2 in studentGroup
         select student2.ExamScores.Average()
     ).Max()
 };

var queryGroupMax =
 from student in students
 group student by student.Year into studentGroup
 select new
 {
     Level = studentGroup.Key,
     HighestScore = (
         from student2 in studentGroup
         select student2.ExamScores.Average()
     ).Max()
 };

var queryGroupMax =
 from student in students
 group student by student.Year into studentGroup
 select new
 {
     Level = studentGroup.Key,
     HighestScore = (
         from student2 in studentGroup
         select student2.ExamScores.Average()
     ).Max()
 };

Thanks for your time,
Mark

PS: I get what it is doing and i do understand all the keywords just don't know the order of execution

I need help with understanding the flow of LINQ query expressions

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