how to insert given number of empty columns for existing table in oracle

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I have an integer variable called x. I want a select query with creating x number of empty columns. How can I write this ? I can't use loop because I have to use this query as a c# string in my application.

as an example I can create one empty column as below

SQL

SELECT a.str_typeid, a.str_typename, a.str_status, a.strlst_user,
       a.dt_entdate, '' as empty_column
  FROM ref_productitem_disc a

Then I want use x to number of empty columns. In other words , how can I create x number of empty columns?

Posted 12-Jan-15 22:23pm

Prabhani Panamulla

Updated 12-Jan-15 22:24pm

v2

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Praveen Kumar Upadhyay · Accepted Answer · 2015-01-12T22:55:00

Your c# code to construct the emply column.

C#

public static string show(int r)
        {
            if (r > 0)
            {
                List<string> list = new List<string>();
                for (int i = 0; i < r; i++)
                {
                    list.Add("'' as emplty_column" + (i + 1));
                }

                return string.Join(",", list);
            }
            return "";
        }

VB

string val = show(5);
            string strquery = @"SELECT a.str_typeid, a.str_typename, a.str_status, a.strlst_user,
       a.dt_entdate" + ((val == "") ? "" : ","+val) + @"
  FROM ref_productitem_disc a";

Your strQuery will the query.