https://github.com/adi501/linq_interview_questions
LINQ Interview Questions
https://github.com/adi501/linq_interview_questions
interview interview-questions linq linq-to-sql sql
Last synced: 4 months ago
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LINQ Interview Questions
- Host: GitHub
- URL: https://github.com/adi501/linq_interview_questions
- Owner: adi501
- Created: 2025-02-14T16:11:01.000Z (4 months ago)
- Default Branch: master
- Last Pushed: 2025-02-14T16:29:35.000Z (4 months ago)
- Last Synced: 2025-02-14T17:27:32.838Z (4 months ago)
- Topics: interview, interview-questions, linq, linq-to-sql, sql
- Language: C#
- Homepage:
- Size: 12.7 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
**Left Outer Join using LINQ using Query Syntax**
```
//Performing Left Outer Join using LINQ using Query Syntax
//Left Data Source: tbl_Courses
//Right Data Source: tbl_Students
//Note: Left and Right Data Source Matters
var data = from course in objDB.tbl_Courses //Left Data Source
join student in objDB.tbl_Students //Right Data Source
on course.Id equals student.Course_Id //Inner Join Condition
into stude //Performing LINQ Group Join
from stu in stude.DefaultIfEmpty() //Performing Left Outer Join
select new { stu.Name, course_Name = course.Name }; //Projecting the Result to Anonymous Type
foreach (var d in data)
{
Console.WriteLine(d.Name+"---"+d.course_Name);
}
Console.ReadLine();
```
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**Find Even Numbers given List using LINQ**
```
List numbers=new List() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
//Method 1 : find Even Numbers from List
var evenNumbers = from num in numbers
where num % 2 == 0
select num;
//Method 2 : find Even Numbers from List
var evenNumbers2 = numbers.FindAll(numbers => numbers % 2 == 0);
//Method 3 : find Even Numbers from List
var evenNumbers3 = numbers.Where(numbers => numbers % 2 == 0);
foreach(var num in evenNumbers3)
{
Console.WriteLine(num); //O/P : 2,4,6,8,10
}
Console.ReadLine();
```
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**Group By in LINQ**
```
List _employees = new List
{
new Employee { Id = 1, Name = "A", Department = "HR", Salary = 10000 },
new Employee { Id = 2, Name = "B", Department = "IT", Salary = 15000 },
new Employee { Id = 3, Name = "C", Department = "IT", Salary = 12000 },
new Employee { Id = 4, Name = "D", Department = "HR", Salary = 11000 },
new Employee { Id = 5, Name = "E", Department = "HR", Salary = 9000 },
new Employee { Id = 6, Name = "F", Department = "IT", Salary = 13000 }
};
//Method1: Group By Department and find Max Salary and Total Salary
var groupData1 = from emp in _employees
group emp by emp.Department into egroup
select new
{
Department = egroup.Key,
//Employees = egroup,
MaxSal = egroup.Max(e => e.Salary),
TotalSal = egroup.Sum(e => e.Salary)
};
//Method2: Group By Department and find Max Salary and Total Salary
var groupData2 = _employees.GroupBy(e => e.Department)
.Select(g => new { Department = g.Key, MaxSal = g.Max(e => e.Salary), TotalSal = g.Sum(e => e.Salary) });
foreach (var d in groupData2)
{
Console.WriteLine(d.Department + " " + d.MaxSal + " " + d.TotalSal);
}
Console.ReadLine();
public class Employee
{
public int Id { get; set; }
public string Name { get; set; }
public string Department { get; set; }
public int Salary { get; set; }
}
```
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