code: func (d *Database) ColumnsQuoted(src interface{}, includePk bool) (string, error) {
  	unquoted, err := d.Columns(src, includePk)
  	if err != nil {
  		return "", err
  	}
  
  	var parts []string
  	for _, elt := range unquoted {
  		parts = append(parts, d.quoted(elt))
  	}
  
  	return strings.Join(parts, ","), nil
  }
docs: // ColumnsQuoted is similar to Columns, but it return the list of columns in the form:
  //   `column1`,`column2`,...
  // using Quote as the quote character.