Coalesce is also available in Sybase
This functions evaluates the listed expressions and returns the first non-null value. If all the expressions are null, coalesce returns null

USAGE: coalesce(expression, expression [, expression]...)

EXAMPLE: coalesce(initialqty,finalqty,middleqty)

Returns the first occurrence of a non-NULL value in either the initialqty or finalqty or middleqty

CREATE TABLE #TMP_COL(
Office_phno char(12),
mobile_nos char(12),
home_phnos char(12))

INSERT INTO #TMP_COL VALUES ('NULL','NULL','55555')

Select Coalesce (Office_phno, mobile_nos, home_phnos) as ContactNo FROM #TMP_COL

Answer:

ContactNo
---------
NULL

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