Select top 10 in pivot special...

Question

How can I get the top 10 customers in the selected period. Group only customer.
Then use these 10 customers and list them in each month, regardless what value they have on each month. The total value in the hole period should decide that. Group Year_Month and Customer. Show each customer in a separate field. Order by the biggest customer first. I'm stucked... Alex has help me so far with this, but this is not 100% right.
Select sales, year_month, customer From
Select sales, year_month, customer, rank() over (Partition by year_month Order by sales Desc) Rang
From (Select Sum(SalesQty) As sales, customer, year_month From CustTable Where year_month Between 200709 And 200801 Group by customer, year_month) tempa
) tempb
Where Rang <=10 Order by year_month, sales Desc;It should return something like this:
YEAR_MONTH                        Statiol                             Mc Donalds 
200709                                 90443062,9                             86446636,4
200710                               103277956,29                           100488081,38
200711                                 95907009,9                             39525297,2
200712                                93945336,26                            58435507,81
200801                                85986272,49                            29581584,28

Answer 1

Sorry, I overlooked "top 10 customers in the selected period. Group only customer" which tells me you need to rank sales for the whole period. If so, use:
SELECT  year_month,
        SUM(
            CASE CustomerTotalSalesRank
              WHEN 1
                THEN
                  SalesQty
                ELSE
                  NULL;
            END
           ) customer_1,
        SUM(
            CASE CustomerTotalSalesRank
              WHEN 2
                THEN
                  SalesQty
                ELSE
                  NULL;
            END
           ) customer_2,
        SUM(
            CASE CustomerTotalSalesRank
              WHEN 3
                THEN
                  SalesQty
                ELSE
                  NULL;
            END
           ) customer_3,
        SUM(
            CASE CustomerTotalSalesRank
              WHEN 4
                THEN
                  SalesQty
                ELSE
                  NULL;
            END
           ) customer_4,
        SUM(
            CASE CustomerTotalSalesRank
              WHEN 5
                THEN
                  SalesQty
                ELSE
                  NULL;
            END
           ) customer_5,
        SUM(
            CASE CustomerTotalSalesRank
              WHEN 6
                THEN
                  SalesQty
                ELSE
                  NULL;
            END
           ) customer_6,
        SUM(
            CASE CustomerTotalSalesRank
              WHEN 7
                THEN
                  SalesQty
                ELSE
                  NULL;
            END
           ) customer_7,
        SUM(
            CASE CustomerTotalSalesRank
              WHEN 8
                THEN
                  SalesQty
                ELSE
                  NULL;
            END
           ) customer_8,
        SUM(
            CASE CustomerTotalSalesRank
              WHEN 9
                THEN
                  SalesQty
                ELSE
                  NULL;
            END
           ) customer_8,
        SUM(
            CASE CustomerTotalSalesRank
              WHEN 10
                THEN
                  SalesQty
                ELSE
                  NULL;
            END
           ) customer_10
  FROM  (
         SELECT  year_month,
                 SalesQty,
                 ROW_NUMBER() OVER(PARTITION BY customer ORDER BY CustomerTotalSales DESC) CustomerTotalSalesRank
           FROM  (
                  SELECT  customer,
                          year_month,
                          SalesQty,
                          SUM(SalesQty) OVER(PARTITION BY customer) CustomerTotalSales
                    FROM  CustTable
                    WHERE year_month BETWEEN 200709 AND 200801
  WHERE CustomerTotalSalesRank <= 10
  GROUP BY year_month
/SY.