how can write mutual friends query

Question

CREATE TABLE [dbo].[Friends] (

[FriendshipId] INT IDENTITY (1, 1) NOT NULL,

[MyId] INT NULL,

[FriendId] INT NULL,

[Status] INT NULL,

[MeOnline] INT NULL,

[FriendOnline] INT NULL,

[PingStatus] INT NULL

);

--this view friends

CREATE VIEW [dbo].[frdsView]

AS

select MyId,Id,F_Name+' '+L_Name as Name,Pic,Counttry,case when Status=1 then'Friends' else 'Request send'end as friend from

RegisterTable full outer join FriendsTable on FriendId=Id

where MyId=MyId

--how can i find mutual friends