Here is a sample code. Hope this helps
CREATE TABLE #SampleTable
(
ID INT IDENTITY(1,1),
Info VARCHAR(100)
)
INSERT INTO #SampleTable
SELECT 'Raj,30' UNION ALL
SELECT 'Mac,28' UNION ALL
SELECT 'John,32'
SELECT * FROM #SampleTable
UPDATE #SampleTable
SET Info = Info + ',Black'
WHERE ID = 1
SELECT * FROM #SampleTable
DROP TABLE #SampleTable