Something like this maybe?

DECLARE @factorial VARCHAR(255)

SET @factorial = ''

CREATE TABLE #temp

(

id INT,

value VARCHAR(255)

)

INSERT INTO #temp

(id,

value)

SELECT 1,

'19'

UNION

SELECT 2,

'90'

UNION

SELECT 3,

'20'

UNION

SELECT 4,

'8'

UNION

SELECT 5,

'9'

UPDATE #temp

SET @factorial = value = ( CASE

WHEN @factorial <> '' THEN @factorial + ' + '

ELSE @factorial

END ) + value

SELECT *

FROM #temp

DROP TABLE #temp