Returning rows that has matching record in another table

I have Table Students with columns Student ID and Student Name. I also have Ta开发者_如何学编程ble Events with columns ID, Student ID and Event.

Now, i want to write a query that will return only rows from Students Table that has its Student ID present in Events Table.

I am running MySql 5+.

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Simple, inner join:

SELECT DISTINCT(Students.Id, Students.StudentName)
FROM Students
JOIN Events on Students.StudentId = Events.StudentId
ORDER BY Students.StudentName

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besides JOIN and IN you can also use EXISTS

SELECT * FROM Students s
WHERE EXISTS  (SELECT * 
                    FROM Events e
                    WHERE e.StudentID = s.StudentID)

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SELECT * FROM Students
WHERE StudentID IN (SELECT StudentID 
                    FROM Events 
                    WHERE Events.StudentID = Students.StudentID) 

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You can write WHERE StudentId IN SELECT StudentId FROM Events. (Or at least you can in SQL Server)

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select students.ID, students.name 
from students join events on students.id = events.studentID 
group by students.ID, students.name

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SELECT DISTINCT s.* FROM Students s INNER JOIN Events e ON e.StudentId = s.id;