Working on "Join Game" feature.

Shogi.Database/Session/Stored Procedures/SetPlayer2.sql

@@ -0,0 +1,16 @@
+CREATE PROCEDURE [session].[SetPlayer2]
+	@SessionName [session].[SessionName],
+	@Player2Name [user].[UserName] NULL
+AS
+BEGIN
+	SET NOCOUNT ON;
+
+	DECLARE @player2Id BIGINT;
+	SELECT @player2Id = Id FROM [user].[User] WHERE [Name] = @Player2Name;
+
+	UPDATE sess
+	SET Player2Id = @player2Id
+	FROM [session].[Session] sess
+	WHERE sess.[Name] = @SessionName;
+
+END