Row level trigger

Hi all

I am doing a DB porting project in which i need to translate oracle specific queries to sql server.I need to convert following trigger to sqlserver specific .Any help will be appreciated

CREATE OR REPLACE TRIGGER T_BI_R_TARGET_OBJECTIVE
BEFORE INSERT
ON TARGET_OBJECTIVE
REFERENCING OLD AS OLD NEW AS NEW
FOR EACH ROW WHEN (NEW.TARGET_OBJECTIVE_ID IN (NULL,0))
DECLARE
seq_id NUMBER;
BEGIN
SELECT TARGET_OBJECTIVE_ID_SEQ.NEXTVAL INTO seq_id FROM dual;
:new.TARGET_OBJECTIVE_ID := seq_id;
END;

Regards
sreenathFirst of all read thru SQL books online for TRIGGERS topic which explains the information on SQL Server.

HTH