SQL Server: Select in vs or?

Question

Which is faster?

SELECT UserName
FROM dbo.UserTable
WHERE UserID in (1,3,4)

---

SELECT UserName
FROM dbo.UserTable
WHERE UserID =         


        

Answer 1

This is relevant when it comes to producing SQL via Linq. There are some instances where the sql created is in the form of: field='xxx' OR field='yyy'.

Answer 2

Due to Sql Server's optimization of queries these will run at the same speed since they are logically equivalent.

i favor the IN syntax for brevity and readability though.

Answer 3

Actually it is the same.

If you display the estimated execution plan you will see that it is performing the same action.