维度模型数据仓库（十八） —— 迟到的事实

USE dw;
CREATE VIEW entry_date_dim (entry_date_sk , entry_date , month_name , month , quarter , year , promo_ind , effective_date , expiry_date) AS
    SELECT 
        date_sk,
        date,
        month_name,
        month,
        quarter,
        year,
        promo_ind,
        effective_date,
        expiry_date
    FROM
        date_dim;

ALTER TABLE sales_order_fact ADD entry_date_sk INT AFTER receive_date_sk;
ALTER TABLE sales_order_fact ADD CONSTRAINT FOREIGN KEY (entry_date_sk) REFERENCES date_dim(date_sk);

USE dw;

-- 设置SCD的截止时间和生效时间
SET @pre_date = SUBDATE(CURRENT_DATE,1) ;

-- 设置CDC的上限时间
UPDATE cdc_time SET current_load = CURRENT_DATE ;

-- 装载客户维度
TRUNCATE TABLE customer_stg;
INSERT INTO customer_stg
SELECT 
  customer_number
, customer_name
, customer_street_address
, customer_zip_code
, customer_city
, customer_state
, shipping_address
, shipping_zip_code
, shipping_city
, shipping_state
FROM source.customer ;
/* 在所有地址列上 SCD2                           */
/* 置过期                          */
UPDATE customer_dim a,
    customer_stg b 
SET 
    expiry_date = @pre_date
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 = '2200-01-01';
/* 加新行                          */
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
, a.version + 1
, @pre_date
, '2200-01-01'
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 = @pre_date )
AND NOT EXISTS (
SELECT *
FROM customer_dim y
WHERE
    b.customer_number = y.customer_number
AND y.expiry_date = '2200-01-01') ;
/* 在 customer_name 列上 SCD1                                             */
UPDATE customer_dim a, customer_stg b
SET a.customer_name = b.customer_name
WHERE a.customer_number = b.customer_number
      AND a.customer_name <> b.customer_name ;
/* 新增的客户                                                   */
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
, 1
, @pre_date
,'2200-01-01'
FROM customer_stg
WHERE customer_number NOT IN(
SELECT y.customer_number
FROM customer_dim x, customer_stg y
WHERE x.customer_number = y.customer_number) ;

/* 重建PA客户维度                               */
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
, version
, effective_date
, expiry_date
FROM customer_dim
WHERE customer_state = 'PA' ;

/* 装载产品维度                                           */
TRUNCATE TABLE product_stg ;
INSERT INTO product_stg
SELECT 
  product_code
, product_name
, product_category
FROM source.product ;
/* 在 product_name 和 product_category 列上 SCD2                                    */
/* 置过期                                 */
UPDATE
  product_dim a
, product_stg b
SET
  expiry_date = @pre_date
WHERE
    a.product_code = b.product_code
AND (   a.product_name <> b.product_name
     OR a.product_category <> b.product_category)
AND expiry_date = '2200-01-01';
/* 加新行                                */
INSERT INTO product_dim
SELECT
  NULL
, b.product_code
, b.product_name
, b.product_category
, a.version + 1
, @pre_date
,'2200-01-01'
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 = @pre_date)
AND NOT EXISTS (
SELECT *
FROM product_dim y
WHERE     b.product_code = y.product_code
      AND y.expiry_date = '2200-01-01') ;
/* 新增的产品                                                    */
INSERT INTO product_dim
SELECT
  NULL
, product_code
, product_name
, product_category
, 1
, @pre_date
, '2200-01-01'
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) ;

/* PRODUCT_COUNT_FACT POPULATION                                       */
TRUNCATE product_count_fact;

INSERT INTO product_count_fact(product_sk, product_launch_date_sk)
SELECT
  a.product_sk
, b.date_sk
FROM
  product_dim a
, date_dim b
WHERE
a.effective_date = b.date
GROUP BY product_code;
/* END OF PRODUCT_COUNT_FACT POPULATION                                */

-- 装载事实表，新增前一天的订单
INSERT INTO sales_order_fact
SELECT
  customer_sk
, product_sk
, g.sales_order_attribute_sk
, e.order_date_sk
, NULL
, NULL
, NULL
, NULL
, h.entry_date_sk
, 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
, sales_order_attribute_dim g
, entry_date_dim h
, cdc_time i
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.entry_date = h.entry_date
AND a.request_delivery_date = f.request_delivery_date
AND a.verification_ind = g.verification_ind
AND a.credit_check_flag = g.credit_check_flag
AND a.new_customer_ind = g.new_customer_ind
AND a.web_order_flag = g.web_order_flag
AND a.entry_date >= i.last_load AND a.entry_date < i.current_load ;

/* UPDATING the new sales order to Allocated status           */
UPDATE sales_order_fact a,
    source.sales_order b,
    allocate_date_dim c,
    cdc_time h
SET 
    a.allocate_date_sk = c.allocate_date_sk,
    a.allocate_quantity = b.quantity
WHERE
    order_status = 'A'
        AND b.entry_date >= h.last_load AND b.entry_date < h.current_load
        AND b.order_number = a.order_number
        AND c.allocate_date = b.status_date ;

/* UPDATING the allocated order to Packed status              */
UPDATE sales_order_fact a,
    source.sales_order b,
    packing_date_dim d,
    cdc_time h
SET 
    a.packing_date_sk = d.packing_date_sk,
    a.packing_quantity = b.quantity
WHERE
    order_status = 'P'
        AND b.entry_date >= h.last_load AND b.entry_date < h.current_load
        AND b.order_number = a.order_number
        AND d.packing_date = b.status_date ;

/* UPDATING the packed order to Shipped status                */
UPDATE sales_order_fact a,
    source.sales_order b,
    ship_date_dim e,
    cdc_time h
SET 
    a.ship_date_sk = e.ship_date_sk,
    a.ship_quantity = b.quantity
WHERE
    order_status = 'S'
        AND b.entry_date >= h.last_load AND b.entry_date < h.current_load
        AND b.order_number = a.order_number
        AND e.ship_date = b.status_date ;

/* UPDATING the shipped order to Received status              */
UPDATE sales_order_fact a,
    source.sales_order b,
    receive_date_dim f,
    cdc_time h
SET 
    a.receive_date_sk = f.receive_date_sk,
    a.receive_quantity = b.quantity
WHERE
    order_status = 'R'
        AND b.entry_date >= h.last_load AND b.entry_date < h.current_load
        AND b.order_number = a.order_number
        AND f.receive_date = b.status_date ;

-- 更新时间戳表的last_load字段
UPDATE cdc_time SET last_load = current_load ;

COMMIT ;

USE dw;

SET @pre_date = SUBDATE(CURRENT_DATE,1) ;

/* late arrival, amount & quantity already exist for the past months*/
UPDATE month_end_sales_order_fact a,
    (SELECT 
        d.month_sk month_sk,
            a.product_sk product_sk,
            SUM(order_amount) order_amount,
            SUM(order_quantity) order_quantity
    FROM
        sales_order_fact a, order_date_dim b, entry_date_dim c, month_dim d
    WHERE
        a.order_date_sk = b.order_date_sk
            AND a.entry_date_sk = c.entry_date_sk
            AND c.month = MONTH(@pre_date)
            AND c.year = YEAR(@pre_date)
            AND b.month = d.month
            AND b.year = d.year
            AND b.order_date <> c.entry_date
    GROUP BY d.month_sk , a.product_sk) b 
SET 
    month_order_amount = month_order_amount + b.order_amount,
    month_order_quantity = month_order_quantity + b.order_quantity
where
    a.product_sk = b.product_sk
        and a.order_month_sk = b.month_sk;

INSERT INTO month_end_sales_order_fact
/* normal (order_date = entry_date)                                   */
SELECT 
    d.month_sk,
    a.product_sk,
    SUM(order_amount),
    SUM(order_quantity)
FROM
    sales_order_fact a,
    order_date_dim b,
    entry_date_dim c,
    month_dim d
WHERE
    a.order_date_sk = b.order_date_sk
        AND a.entry_date_sk = c.entry_date_sk
        AND c.month = MONTH(@pre_date)
        AND c.year = YEAR(@pre_date)
        AND b.month = d.month
        AND b.year = d.year
        AND b.order_date = c.entry_date
GROUP BY d.month_sk , a.product_sk 
union all 
/* late arrival but amount & quantity not exist for the past months*/
SELECT 
    d.month_sk,
    a.product_sk,
    SUM(order_amount),
    SUM(order_quantity)
FROM
    sales_order_fact a,
    order_date_dim b,
    entry_date_dim c,
    month_dim d
WHERE
    a.order_date_sk = b.order_date_sk
        AND a.entry_date_sk = c.entry_date_sk
        AND b.order_date <> c.entry_date
        AND c.month = MONTH(@pre_date)
        AND c.year = YEAR(@pre_date)
        AND b.month = d.month
        AND b.year = d.year
        AND NOT EXISTS( SELECT 
            1
        FROM
            month_end_sales_order_fact p,
            month_dim s
        WHERE
            p.order_month_sk = s.month_sk
                AND s.month = d.month
                AND s.year = d.year
                AND p.product_sk = a.product_sk)
GROUP BY d.month_sk , a.product_sk;

COMMIT ;

USE source;
INSERT INTO sales_order VALUES
/* late arrival                                                       */
  (62, 6, 2, 'Y', 'Y', 'Y', 'N', '2015-02-25', 'N', '2015-03-30',
       '2015-03-26', 1000, 10)
, (63, 6, 1, 'Y', 'Y', 'Y', 'N', '2015-02-26', 'N', '2015-03-30',
       '2015-03-26', 1000, 10)
/* normal                                                             */
, (64, 12, 5, 'Y', 'N', 'Y', 'N', '2015-03-26', 'N', '2015-03-30',
       '2015-03-26', 2000, 20)
;

COMMIT;