SQL Server - Valor Máximo de diferentes columnas

DECLARE @myTable TABLE (columnID INT , column1 INT, column2 INT, column3 INT, column4 VARCHAR(50))

INSERT INTO @myTable SELECT 1, 100, 300, 200, 'Valor 01'

INSERT INTO @myTable SELECT 2, 600, 400, 500, 'Valor 02'

INSERT INTO @myTable SELECT 3, 700, 800, 900, 'Valor 03'

INSERT INTO @myTable SELECT 4, 1000, 1001, 123, 'Valor 04'

select * from @myTable

SELECT (

SELECT MAX(filaMaxima) FROM ( VALUES(column1),(column2),(column3) ) AS UNIQUECOLUMN(filaMaxima)

) AS FilaValorMaximo, column4 as Nombre

FROM @myTable