text: 
  with wscs as
   (select sold_date_sk
          ,sales_price
    from  select ws_sold_date_sk sold_date_sk
                ,ws_ext_sales_price sales_price
          from web_sales 
          union all
          select cs_sold_date_sk sold_date_sk
                ,cs_ext_sales_price sales_price
          from catalog_sales),
   wswscs as 
   (select d_week_seq,
          sum(case when (d_day_name='Sunday') then sales_price else null end) sun_sales,
          sum(case when (d_day_name='Monday') then sales_price else null end) mon_sales,
          sum(case when (d_day_name='Tuesday') then sales_price else  null end) tue_sales,
          sum(case when (d_day_name='Wednesday') then sales_price else null end) wed_sales,
          sum(case when (d_day_name='Thursday') then sales_price else null end) thu_sales,
          sum(case when (d_day_name='Friday') then sales_price else null end) fri_sales,
          sum(case when (d_day_name='Saturday') then sales_price else null end) sat_sales
   from wscs
       ,date_dim
   where d_date_sk = sold_date_sk
   group by d_week_seq)
   select d_week_seq1
         ,round(sun_sales1/sun_sales2,2)
         ,round(mon_sales1/mon_sales2,2)
         ,round(tue_sales1/tue_sales2,2)
         ,round(wed_sales1/wed_sales2,2)
         ,round(thu_sales1/thu_sales2,2)
         ,round(fri_sales1/fri_sales2,2)
         ,round(sat_sales1/sat_sales2,2)
   from
   (select wswscs.d_week_seq d_week_seq1
          ,sun_sales sun_sales1
          ,mon_sales mon_sales1
          ,tue_sales tue_sales1
          ,wed_sales wed_sales1
          ,thu_sales thu_sales1
          ,fri_sales fri_sales1
          ,sat_sales sat_sales1
    from wswscs,date_dim 
    where date_dim.d_week_seq = wswscs.d_week_seq and
          d_year = 2001) y,
   (select wswscs.d_week_seq d_week_seq2
          ,sun_sales sun_sales2
          ,mon_sales mon_sales2
          ,tue_sales tue_sales2
          ,wed_sales wed_sales2
          ,thu_sales thu_sales2
          ,fri_sales fri_sales2
          ,sat_sales sat_sales2
    from wswscs
        ,date_dim 
    where date_dim.d_week_seq = wswscs.d_week_seq and
          d_year = 2001+1) z
   where d_week_seq1=d_week_seq2-53
   order by d_week_seq1;
  
  
  