삼라만상

function nvl(expr1, expr2) { if (expr1==null || expr1===undefined || expr1=="") { expr1 = expr2; } return expr1; } function nvl2(expr1, expr2, expr3) { if (expr1==null || expr1===undefined || expr1=="") { expr1 = expr3; } else { expr1 = expr2; } return expr1; }