Revising the Regular Population Script


Another thing you need to do after degenerating a dimension is revise the regular population script. The revised script needs to enter order numbers to the sales order fact and no longer needs to populate the order dimension.

Listing 17.2 shows the revised regular population script.

Listing 17.2: Revised daily DW regular population

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 /*****************************************************************/ /*                                                               */ /* dw_regular_17.sql                                             */ /*                                                               */ /*****************************************************************/ USE dw; /* CUSTOMER_DIM POPULATION                                       */ TRUNCATE customer_stg; LOAD DATA INFILE 'customer.csv' INTO TABLE customer_stg FIELDS TERMINATED BY ', ' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '\r\n' IGNORE 1 LINES ( customer_number , customer_name , customer_street_address , customer_zip_code , customer_city , customer_state , shipping_address , shipping_zip_code , shipping_city , shipping_state ) ; /* SCD 2 ON ADDRESSES                                            */ UPDATE   customer_dim a , customer_stg b SET   a.expiry_date = SUBDATE (CURRENT_DATE, 1) WHERE   a.customer_number = b.customer_number AND (   a.customer_street_address <> b.customer_street_address      OR a.customer_city <> b.customer_city      OR a.customer_zip_code <> b.customer_zip_code      OR a.customer_state <> b.customer_state      OR a.shipping_address <> b.shipping_address      OR a.shipping_city <> b.shipping_city      OR a.shipping_zip_code <> b.shipping_zip_code      OR a.shipping_state <> b.shipping_state      OR a.shipping_address IS NULL      OR a.shipping_city IS NULL      OR a.shipping_zip_code IS NULL      OR a.shipping_state IS NULL) AND expiry_date - '9999-12-31' ; INSERT INTO customer_dim SELECT   NULL , b.customer_number , b.customer_name , b.customer_street_address , b.customer_zip_code , b.customer_city , b.customer_state , b.shipping_address , b.shipping_zip_code , b.shipping_city , b.shipping_state , CURRENT_DATE , '9999-12-31' FROM   customer_dim a , customer_stg b WHERE     a.customer_number = b.customer_number AND ( a.customer_street_address <> b.customer_street_address      OR a.customer_city <> b.customer_city      OR a.customer_zip_code <> b.customer_zip_code      OR a.customer_state <> b.customer_state      OR a.shipping_address <> b.shipping_address      OR a.shipping_city <> b.shipping_city      OR a.shipping_zip_code <> b.shipping_zip_code      OR a.shipping_state <> b.shipping_state      OR a.shipping_address IS NULL      OR a.shipping_city IS NULL      OR a.shipping_zip_code IS NULL      OR a.shipping_state IS NULL) AND EXISTS ( SELECT * FROM customer_dim x WHERE b.customer_number = x.customer_number AND a.expiry_date = SUBDATE (CURRENT_DATE, 1)) AND NOT EXISTS ( SELECT * FROM customer_dim y WHERE     b.customer_number = y.customer_number       AND y.expiry_date = '9999-12-31') ; /* END OF SCD 2                                                  */ /* SCD 1 ON NAME                                                 */ UPDATE customer_dim a, customer_stg b SET a.customer_name = b.customer_name WHERE     a.customer_number = b.customer_number       AND a.expiry_date = '9999-12-31'       AND a.customer name <> b.customer name ; /* ADD NEW CUSTOMER                                              */ INSERT INTO customer_dim SELECT   NULL , customer_number , customer_name , customer_street_address , customer_zip_code , customer_city , customer_state , shipping_address , shipping_zip_code , shipping_city , shipping_state , CURRENT_DATE , '9999-12-31' FROM customer_stg WHERE customer_number NOT IN( SELECT a.customer_number FROM   customer_dim a , customer_stg b WHERE b. customer_number = a.customer_number ) ; /* RE-BUILD PA CUSTOMER DIMENSION                                 */ TRUNCATE pa_customer_dim; INSERT INTO pa_customer_dim SELECT   customer_sk , customer_number , customer_name , customer_street_address , customer_zip_code , customer_city , customer_state , shipping_address , shipping_zip_code , shipping_city , shipping_state , effective_date , expiry_date FROM customer_dim WHERE customer state = 'PA' ; /* END OF CUSTOMER_DIM POPULATION                                 */ /* PRODUCT_DIM POPULATION                                         */ TRUNCATE product_stg ; LOAD DATA INFILE 'product.txt' INTO TABLE product_stg FIELDS TERMINATED BY '' OPTIONALLY ENCLOSED BY '' LINES TERMINATED BY '\r\n' IGNORE 1 LINES ( product_code , product_name , product_category ) ; /* SCD2 ON PRODUCT NAME AND GROUP                                 */ UPDATE   product_dim a , product_stg b SET   expiry_date - SUBDATE (CURRENT_DATE, 1) WHERE     a.product_code = b.product_code AND (   a.product_name <> b.product_name      OR a.product_category <> b.product_category )      AND expiry_date = '9999-12-31' ; INSERT INTO product_dim SELECT   NULL , b.product_code , b.product_name , b.product_category , CURRENT_DATE , '9999-12-31' FROM   product_dim a , product_stg b WHERE     a.product_code = b.product_code AND ( a.product_name <> b.product_name      OR a.product_category <> b.product_category ) AND EXISTS ( SELECT * FROM product_dim x WHERE     b.product_code = x.product_code       AND a.expiry_date = SUBDATE (CURRENT_DATE, 1)) AND NOT EXISTS ( SELECT * FROM product_dim y WHERE    b.product_code = y.product_code      AND y.expiry_date - '9999-12-31') ; /* END OF SCD 2                                                   */ /* ADD NEW PRODUCT                                                */ INSERT INTO product_dim SELECT   NULL , product_code , product_name , product_category , CURRENT_DATE , '9999-12-31' FROM product_stg WHERE product_code NOT IN( SELECT y.product_code FROM product_dim x, product_stg y WHERE x.product_code = y.product_code ) ; /* END OF PRODUCT_DIM POPULATION                                  */ /* insert new orders                                              */ INSERT INTO sales_order_fact SELECT   customer_sk , product_sk , e.order_date_sk , NULL , NULL , NULL , NULL , a.order_number , f.request_delivery_date_sk , order_amount , quantity , NULL , NULL , NULL , NULL FROM   source.sales_order a , customer_dim c , product_dim d , order_date_dim e , request_delivery_date_dim f WHERE     a.order_status = 'N' AND a.customer_number = c.customer_number AND a.status_date >= c.effective_date AND a.status_date <= c.expiry_date AND a.product_code = d.product_code AND a.status_date >= d.effective_date AND a.status_date <= d.expiry_date AND a.status_date = e.order_date AND a.request_delivery_date = f.request_delivery_date AND a.entry_date = CURRENT_DATE ; UPDATE   sales_order_fact a , source.sales_order b , allocate_date_dim c SET   a.allocate_date_sk = c.allocate_date_sk , a.allocate_quantity = b.quantity WHERE     order_status = 'A' AND b.entry_date - CURRENT_DATE AND b.order_number = a.order_number AND c.allocate_date = b.status_date ; UPDATE   sales_order_fact a , source.sales_order b , packing_date_dim d SET   a.packing_date_sk = d.packing_date_sk , a.packing_quantity = b.quantity WHERE     order_status = 'P' AND b.entry_date = CURRENT_DATE AND b.order_number = a.order_number AND d.packing_date = b.status_date ; UPDATE   sales_order_fact a , source.sales_order b , ship_date_dim e SET   a.ship_date_sk = e.ship_date_sk , a.ship_quantity = b.quantity WHERE     order_status = 'S' AND b.entry_date = CURRENT_DATE AND b.order_number = a.order_number AND e.ship_date = b.status_date ; UPDATE   sales_order_fact a , source.sales_order b , receive_date_dim f SET   a.receive_date_sk = f.receive_date_sk , a.receive_quantity = b.quantity WHERE     order_status = 'R' AND b.entry_date = CURRENT_DATE AND b.order_number = a.order_number AND f.receive date = b.status_date ; /* end of script                                                 */
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Dimensional Data Warehousing with MySQL. A Tutorial
Dimensional Data Warehousing with MySQL: A Tutorial
ISBN: 0975212826
EAN: 2147483647
Year: 2004
Pages: 149

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