import java.util.ArrayList;
import java.util.List;

import org.json.JSONException;

public class MrTest {
    public static void main(String args[]) throws JSONException
    {
        ArrayList<String> total_list = new ArrayList<String>();
        ArrayList<String> sub_list = new ArrayList<String>();
        ArrayList<String> un_common_list = new ArrayList<String>();
        total_list.add("Beverages");
        total_list.add("Hot");
        total_list.add("Sai1");
        total_list.add("Sai2");
        total_list.add("Sai3");



        sub_list.add("Sai1");
        sub_list.add("Sai2");
        sub_list.add("Sai3");


        boolean inlist=false;
         for(int i=0;i<total_list.size();i++)
            {
                String total_name = total_list.get(i);
                for(int k=0;k<sub_list.size();k++)
                {
                    String sub_name = sub_list.get(k);
                    if(total_name.equals(sub_name))
                    {
                      inlist=true;
                    }
                }
               if (!inlist){un_common_list.add(total_name);}
               inlist=false;
          }
    StringBuilder query_builder = new StringBuilder();
    query_builder.append("Update category SET ");
    //System.out.println(sub_list.size());
    for(int i=total_list.size();i>=1;i--)
    {
        if(i!=1)
        {
        query_builder.append("T"+i);
        query_builder.append(" = ");

        query_builder.append("NULL");
        query_builder.append(" , ");
        }
        else
        {
            query_builder.append("T"+i);
            query_builder.append(" = ");

            query_builder.append("NULL");

        }

    }

    System.out.println("UncommonList is "+un_common_list);
    System.out.println(query_builder);

    }

}

Update category SET T5 = NULL , T4 = NULL , T3 = NULL , T2 = NULL , T1 = NULL


UncommonList is [Beverages, Hot]

Update category SET T5 = NULL , T4 = NULL , T3 = NULL  where T2 = 'Hot'  AND  T1 = 'Beverages'