Nth highest no in sql

-- Set the no r = Variable what you want.

SELECT *

  FROM (SELECT ENAME, SALARY, DENSE_RANK () OVER (ORDER BY SALARY DESC) R

          FROM EMP)

 WHERE R = :Variable

Confirm message in oracle apex

javascript:apex.confirm('Do you want to post the voucher?','POST');

Setting item value from interactive grid column

Create dynamic action 

when

Selection grid interactive grid

grid name

 var i, selectedIds = "",

    model = this.data.model;

for ( i = 0; i < this.data.selectedRecords.length; i++ ) {

    selectedIds += model.getValue( this.data.selectedRecords[i], "GROUP_CODE") ;//+ ","; here group_code is value item change as your required column name

}

$s("P55_GRP_CODE", selectedIds);//here P55_GRP_CODE IS Affected item replace as your required item name