You should use this filter hook code for the Custom DataBase Tables if you want to be able to click the specific column value that stored the strings of url at the time of using shortcode. Also this filter is enable since plugin version 2.x.

clickable_url_column.php

<?php
// Please insert this code to as like your theme's "functions.php". 
// Note: you should be modified variable of "$target_table" and "$url_column" in this code.

function cdbt_custom_clickable_url( $columns, $shortcode_name, $table ) {
  $target_table = 'string'; // Your table name that you want to filter.
  $url_column = 'varchar'; // This column name should be stored the url strings, and  column type is "varchar".
  if ( $target_table === $table ) {
    foreach ( $columns as $_i => $_column ) {
      if ( $url_column === $_column['property'] ) {
        $_custom_column = sprintf( 'rowData.%1$s != "" ? $("<a/>").attr("href",_.unescape(rowData.%1$s)).attr("target","_blank").text(_.unescape(rowData.%1$s)) : rowData.%1$s', $url_column );
        $columns[$_i]['customColumnRenderer'] = $_custom_column;
      }
    }
  }
  return $columns;
}
add_filter( 'cdbt_shortcode_custom_columns', 'cdbt_custom_clickable_url', 10, 3 );