how to add a new column as first column of data table

how to add a new column as first column of data table

hi,

following is the code, which brings  six cols ,i need to add
a col as first col in the table then i wiil fill it up with relevent running numbers .

  1. <!DOCTYPE html>
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title></title>
        <script src="Scripts/jquery-3.2.1.js"></script>
        <link href="Scripts/DataTables-1.10.16/css/jquery.dataTables.css" rel="stylesheet" />
        <script src="Scripts/DataTables-1.10.16/js/jquery.dataTables.js"></script>


      
        <script type="text/javascript">

            var dataSet = [
         ["Tiger Nixon", "System Architect", "Edinburgh", "5421", "2011/04/25", "$320,800"],
         ["Garrett Winters", "Accountant", "Tokyo", "8422", "2011/07/25", "$170,750"],
         ["Ashton Cox", "Junior Technical Author", "San Francisco", "1562", "2009/01/12", "$86,000"],
         ["Cedric Kelly", "Senior Javascript Developer", "Edinburgh", "6224", "2012/03/29", "$433,060"],
         ["Airi Satou", "Accountant", "Tokyo", "5407", "2008/11/28", "$162,700"],
         ["Brielle Williamson", "Integration Specialist", "New York", "4804", "2012/12/02", "$372,000"],
         ["Herrod Chandler", "Sales Assistant", "San Francisco", "9608", "2012/08/06", "$137,500"],
         ["Rhona Davidson", "Integration Specialist", "Tokyo", "6200", "2010/10/14", "$327,900"],
         ["Colleen Hurst", "Javascript Developer", "San Francisco", "2360", "2009/09/15", "$205,500"],
         ["Sonya Frost", "Software Engineer", "Edinburgh", "1667", "2008/12/13", "$103,600"],
         ["Jena Gaines", "Office Manager", "London", "3814", "2008/12/19", "$90,560"],
         ["Quinn Flynn", "Support Lead", "Edinburgh", "9497", "2013/03/03", "$342,000"],
         ["Charde Marshall", "Regional Director", "San Francisco", "6741", "2008/10/16", "$470,600"],
         ["Haley Kennedy", "Senior Marketing Designer", "London", "3597", "2012/12/18", "$313,500"],
         ["Tatyana Fitzpatrick", "Regional Director", "London", "1965", "2010/03/17", "$385,750"],
         ["Michael Silva", "Marketing Designer", "London", "1581", "2012/11/27", "$198,500"],
         ["Paul Byrd", "Chief Financial Officer (CFO)", "New York", "3059", "2010/06/09", "$725,000"],
         ["Gloria Little", "Systems Administrator", "New York", "1721", "2009/04/10", "$237,500"],
         ["Bradley Greer", "Software Engineer", "London", "2558", "2012/10/13", "$132,000"],
         ["Dai Rios", "Personnel Lead", "Edinburgh", "2290", "2012/09/26", "$217,500"],
         ["Jenette Caldwell", "Development Lead", "New York", "1937", "2011/09/03", "$345,000"],
         ["Yuri Berry", "Chief Marketing Officer (CMO)", "New York", "6154", "2009/06/25", "$675,000"],
         ["Caesar Vance", "Pre-Sales Support", "New York", "8330", "2011/12/12", "$106,450"],
         ["Doris Wilder", "Sales Assistant", "Sidney", "3023", "2010/09/20", "$85,600"],
         ["Angelica Ramos", "Chief Executive Officer (CEO)", "London", "5797", "2009/10/09", "$1,200,000"],
         ["Gavin Joyce", "Developer", "Edinburgh", "8822", "2010/12/22", "$92,575"],
         ["Jennifer Chang", "Regional Director", "Singapore", "9239", "2010/11/14", "$357,650"],
         ["Brenden Wagner", "Software Engineer", "San Francisco", "1314", "2011/06/07", "$206,850"],
         ["Fiona Green", "Chief Operating Officer (COO)", "San Francisco", "2947", "2010/03/11", "$850,000"],
         ["Shou Itou", "Regional Marketing", "Tokyo", "8899", "2011/08/14", "$163,000"],
         ["Michelle House", "Integration Specialist", "Sidney", "2769", "2011/06/02", "$95,400"],
         ["Suki Burks", "Developer", "London", "6832", "2009/10/22", "$114,500"],
         ["Prescott Bartlett", "Technical Author", "London", "3606", "2011/05/07", "$145,000"],
         ["Gavin Cortez", "Team Leader", "San Francisco", "2860", "2008/10/26", "$235,500"],
         ["Martena Mccray", "Post-Sales support", "Edinburgh", "8240", "2011/03/09", "$324,050"],
         ["Unity Butler", "Marketing Designer", "San Francisco", "5384", "2009/12/09", "$85,675"]
            ];


            $(document).ready(function () {

                var t = $('#example').DataTable({
                    data: dataSet,
                    "columnDefs": [

                 {
                     "targets": 6
                     , "render": function (data, type, row) {
                         //return x('p');
                         return 1;


                     }

                  
                 }
                    ]
                   ,
                    columns: [



                        { title: "Name" },
                        { title: "Position" },
                        { title: "Office" },
                        { title: "Extn." },
                        { title: "Start date" },
                    { title: "Salary" },
                     { title: "Sno" }

    ]


                });



              
               

            });

        </script>


    </head>
    <body>

        <table id="example" class="display" width="100%"></table>
    </body>
    </html>

yours sincerely