Amazon Redshift: Selecting columns based on a list of columns present in a table

Question

Is it possible in any way (without scripting) to aggregate columns which are stored in a table cell.

Basically what i am trying to achieve here is that if i have the fol

Answer 1

No, you cannot use a column name that comes from the result of another query.

You would need to do this in your own code, sending the result to Amazon Redshift as a complete query. (That is, run one query to obtain the column names, then run a second query with those column names inserted.)