Tips!

SELECT 

DAY('2013-03-03') - DAYS(TO_CHAR(TO_DATE(CHAR(HEX(CURRENT DATE)), 'YYYY-MM-DD'), 'YYYY-MM-DD'))

from sysibm.sysdummy1  

---------------------------------------------------------------------------------------------------------

Java Script Null Check.

function isDefined(str)

{

    var isResult = false;

    str_temp = str + "";

    str_temp = str_temp.replace(" ", "");

    if(str_temp != "undefined" && str_temp != "" && str_temp != "null")

    {

        isResult = true;

    }

    return isResult;

}

출처 : http://ramses8.tistory.com/458