Easy.

CREATE TABLE PS_TestForOnline

(

DAYNBR INT,

MONTHNBR INT,

YEARNBR INT

);

INSERT INTO PS_TestForOnline

VALUES(1,1,2012);

INSERT INTO PS_TestForOnline

VALUES(1,2,2012);

INSERT INTO PS_TestForOnline

VALUES(1,3,2012);

SELECT *, right('0' + cast(DAYNBR as varchar), 2) + '-' + right('0' + cast(MONTHNBR as varchar), 2) + '-' + cast(YEARNBR as varchar) FROM PS_TestForOnline