Alternate To Decode

hi i have a view in oracle. in that i am using decode function.
same query i want to write it in sqlserver. what it is the alternate
to decode.

this is a cross tab query

SELECT code, SUM(DECODE(field1, 4, Present_Value, 0)) AS c1, SUM(DECODE(field1, 5, Present_Value, 0)) AS c2,
SUM(DECODE(field1, 6, Present_Value, 0)) AS c3,SUM(DECODE(field1, 9, Present_Value, 0)) AS c4
FROM (SELECT field1,Code, Present_Value FROM table1) DERIVEDTBL GROUP BY code

thanks

suji