Initial Population | Dimensional Data Warehousing with MySQL: A Tutorial

You populate the month_end_balance_fact table with data in the month_end_sales_order_fact table. Listing 24.2 is the script to initially populate the month_end_balance_fact table.
The script loads the month end sales orders month by month. As you must reset the balance at the beginning of each year, for January the script needs only one Insert that adds the January balance to the month_end_balance_fact table. Starting from February it needs three Insert statements. The first adds the month sales amount of a product to its previous month's if there is a sales order for that product in the previous month. The second Insert statement handles the case when there is no sales record for the product in the previous month. The third Insert statement inserts a copy of the previous month product sales if there's no sales record for the product in the current month.
The last month of the month end sales data you have in the month_end_sales_order_fact table is March 2007.
Listing 24.2: Month end balance initial population
 /*****************************************************************/ /*                                                               */ /* month_end_balance_initial.sql                                 */ /*                                                               */ /*****************************************************************/ USE dw; /* January                                                       */ INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     month = 1 AND m.month order sk = n.month sk ; /* February                                                      */ INSERT INTO month_end_balance_fact SELECT n.month_order_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance), (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month = 1 AND p.month = 2 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk ; INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     n.month = 2 AND m.month_order_sk = n.month_sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM  month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month = 1  AND y.year = n.year ) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quantity_balance FROM   month_end_balance_fact m , month_dim n , month_dim o WHERE     n.month = 1 AND m.month_sk = n.month_sk AND o.month = 2 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM  month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month = 2 AND y.year = n.year) ; /* March                                                         */ INSERT INTO month_end_balance_fact SELECT n.month_order_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance), (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month = 2 AND p.month = 3 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk AND (p.year <= 2007) ; INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     n.month = 3 AND m.month order sk = n.month sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM  month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month = 2  AND y.year = n.year ) AND (n.year <= 2007) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quantity_balance FROM   month_end_balance_fact m , month_dim n , month_dim o WHERE     n.month = 2 AND m.month_sk = n.month_sk AND o.month = 3 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM  month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month = 3 AND y.year = n.year) AND (o.year <= 2007) ; /* April                                                         */ INSERT INTO month_end_balance_fact SELECT n.month_prder_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance), (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month = 3 AND p.month = 4 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk AND (p.year <= 2007) ; INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     n.month = 4 AND m.month_order_sk = n.month_sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM  month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month = 3  AND y.year = n.year ) AND (n.year <= 2007) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quantity_balance FROM   month_end_balance_fact m , month_dim n , month_dim o WHERE     n.month = 3 AND m.month_sk = n.month_sk AND o.month = 4 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM  month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month = 4 AND y.year = n.year) AND (o.year <= 2007) ; /* May                                                           */ INSERT INTO month_end_balance_fact SELECT n.month_order_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance), (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month = 4 AND p.month = 5 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk AND (p.year < 2007) ; INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     n.month = 5 AND m.month_order_sk = n.month_sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM  month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month = 4  AND y.year = n.year ) AND (n.year < 2007) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quant ity_balance FROM   month_end_balance_fact m , month_dim n , month_dim o WHERE     n.month = 4 AND m.month_sk = n.month_sk AND o.month = 5 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM  month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month = 5 AND y.year = n.year) AND (o.year < 2007) ; /* June                                                          */ INSERT INTO month_end_balance_fact SELECT n.month_order_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance) , (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month = 5 AND p.month = 6 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk AND (p.year < 2007) ; INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     n.month = 6 AND m.month_order_sk = n.month_sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM  month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month = 5  AND y.year = n.year ) AND (n.year < 2007) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quantity_balance FROM   month_end_balance_fact m , month dim n , month_dim o WHERE     n.month = 5 AND m.month_sk = n.month_sk AND o.month = 6 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM  month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month = 6 AND y.year = n.year) AND (o.year < 2007) ; /* July                                                          */ INSERT INTO month_end_balance_fact SELECT n.month_order_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance) , (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month = 6 AND p.month = 7 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk AND (p.year < 2007) ; INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     n.month = 7 AND m.month_order_sk = n.month_sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month = 6  AND y.year = n.year ) AND (n.year < 2007) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quantity_balance FROM   month_end_balance_fact m , month_dim n , month_dim o WHERE     n.month = 6 AND m.month_sk = n.month_sk AND o.month = 7 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM  month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month = 7 AND y.year = n.year) AND (o.year < 2007) ; /* August                                                        */ INSERT INTO month_end_balance_fact SELECT n.month_order_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance), (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month = 7 AND p.month = 8 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk AND (p.year < 2007) ; INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     n.month = 8 AND m.month_order_sk = n.month_sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month = 7  AND y.year = n.year ) AND (n.year < 2007) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quantity_balance FROM   month_end_balance_fact m , month_dim n , month_dim o WHERE     n.month = 7 AND m.month_sk = n.month_sk AND o.month = 8 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM  month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month = 8 AND y.year = n.year) AND (o.year < 2007) ; /* September                                                     */ INSERT INTO month_end_balance_fact SELECT n.month_order_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance), (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month = 8 AND p.month = 9 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk AND (p.year < 2007) ; INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     n.month = 9 AND m.month_order_sk = n.month_sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month =  AND y.year = n.year ) AND (n.year < 2007) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quantity_balance FROM   month_end_balance_fact m , month_dim n , month_dim o WHERE     n.month = 8 AND m.month_sk = n.month_sk AND o.month = 9 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month = 9 AND y.year = n.year) AND (o.year < 2007) ; /* October                                                       */ INSERT INTO month_end_balance_fact SELECT n.month_order_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance), (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month = 9 AND p.month =10 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk AND (p.year < 2007) ; INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     n.month = 10 AND m.month_order_sk = n.month_sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month = 9  AND y.year = n.year ) AND (n.year < 2007) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quantity_balance FROM   month_end_balance_fact m , month_dim n , month_dim o WHERE     n.month = 9 AND m.month_sk = n.month_sk AND o.month - 10 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month =10 AND y.year = n.year) AND (o.year < 2007) ; /* November                                                      */ INSERT INTO month_end_balance_fact SELECT n.month_order_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance), (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month = 10 AND p.month = 11 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk AND (p.year < 2007) ; INSERT INTO month_end_balance_fact SELECT m.* FROM    month_end_sales_order_fact m , month_dim n WHERE     n.month =11 AND m.month_order_sk = n.month_sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month =10  AND y.year = n.year ) AND (n.year < 2007) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quantity_balance FROM   month_end_balance_fact m , month_dim n , month_dim o WHERE     n.month =10 AND m.month_sk = n.month_sk AND o.month =11 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month =11 AND y.year = n.year) AND (o.year < 2007) ; /* December                                                      */ INSERT INTO month_end_balance_fact SELECT n.month_order_sk, n.product_sk, (n.month_order_amount +        m.month_end_amount_balance), (n.month_order_quantity +        m.month_end_quantity_balance) FROM   month_end_balance_fact m ,  month_end_sales_order_fact n , month_dim o , month_dim p WHERE     o.month =11 AND p.month =12 AND m.month_sk = o.month_sk AND n.month_order_sk = p.month_sk AND o.year = p.year AND m.product_sk = n.product_sk AND (p.year < 2007) ; INSERT INTO month_end_balance_fact SELECT m.* FROM     month_end_sales_order_fact m , month_dim n WHERE     n.month = 12 AND m.month_order_sk = n.month_sk AND m.product_sk NOT IN (  SELECT x.product_sk  FROM month_end_balance_fact x, month_dim y  WHERE x.month_sk = y.month_sk AND y.month = 11  AND y.year = n.year ) AND (n.year < 2007) ; INSERT INTO month_end_balance_fact SELECT o.month_sk, m.product_sk, m.month_end_amount_balance,        m.month_end_quantity_balance FROM   month_end_balance_fact m , month_dim n , month_dim o WHERE     n.month =11 AND m.month_sk = n.month_sk AND o.month =12 AND n.year = o.year AND m.product_sk NOT IN ( SELECT x.product_sk FROM  month_end_sales_order_fact x, month_dim y WHERE x.month_order_sk = y.month_sk AND y.month =12 AND y.year = n.year) AND (o.year < 2007) ; /* end of script                                                 */