Question

我正在尝试根据产品代码（不同的代码获得不同的折扣）来计算帐户的折扣费用。我正在努力寻找一种方法，可以修改查询，以便在一个查询中为我提供正确的结果，而不是多次运行同一查询并更改折扣和产品代码。

作为一个例子如果代码是AmazonEC2，则对费用应用5％如果代码是AmazonS3，则对费用应用3％，否则，其余的要加1％。

SELECT line_item_usage_account_id
    ,sum(line_item_unblended_cost) AS cost
    ,sum(line_item_unblended_cost * 0.05) AS discounted_cost
    ,sum(line_item_usage_amount) AS usage
    ,CAST(line_item_usage_start_date AS DATE) AS start_day
    ,CAST(line_item_usage_end_date AS DATE) AS end_day
    ,line_item_product_code
FROM cost_management
WHERE line_item_usage_account_id IN ('330')
    AND line_item_usage_start_date BETWEEN DATE '2019-03-01'
        AND DATE '2019-10-01'
    AND line_item_product_code = 'AmazonEC2'
GROUP BY line_item_usage_account_id
    ,CAST(line_item_usage_start_date AS DATE)
    ,CAST(line_item_usage_end_date AS DATE)
    ,line_item_product_code
HAVING sum(line_item_blended_cost) > 0
ORDER BY line_item_usage_account_id

Answer 1

在Case子句中使用Select语句，

CASE
    WHEN line_item_product_code = 'AmazonEC2' 
        THEN sum(line_item_unblended_cost * 0.05)
    WHEN line_item_product_code = 'AmazonS3'  
        THEN sum(line_item_unblended_cost * 0.03)
    ELSE sum(line_item_unblended_cost * 0.01)
END As discounted_cost

Answer 2

请参阅“选择”中的“案例”列

SELECT      line_item_usage_account_id,
                SUM(line_item_unblended_cost) AS cost,
                SUM(line_item_unblended_cost * 0.05) AS discounted_cost,
                SUM(line_item_usage_amount) AS usage,
                CAST(line_item_usage_start_date AS DATE) AS start_day, 
                CAST(line_item_usage_end_date AS DATE) AS end_day,
                line_item_product_code,
                CASE    WHEN    line_item_product_code = 'AmazonEC2' 
                        THEN    SUM(line_item_unblended_cost * 0.05)
                        WHEN    line_item_product_code = 'AmazonS3' 
                        THEN    SUM(line_item_unblended_cost * 0.03)
                        ELSE    SUM(line_item_unblended_cost * 0.01)
                    END discounted_cost2
    FROM        cost_management
    WHERE       line_item_usage_account_id IN ('330')
    AND         line_item_usage_start_date BETWEEN date '2019-03-01' AND date '2019-10-01'
    AND         line_item_product_code ='AmazonEC2'
    GROUP BY    line_item_usage_account_id, CAST(line_item_usage_start_date AS DATE), CAST(line_item_usage_end_date AS DATE), line_item_product_code
    HAVING      sum(line_item_blended_cost) > 0
    ORDER BY    line_item_usage_account_id

Answer 3

如果您想要每个帐户每天或每个帐户的信息，那么我认为您不希望line_item_product_code中的GROUP BY

在这种情况下，您需要条件聚合：

SELECT line_item_usage_account_id,
       SUM(line_item_unblended_cost) AS cost,
       SUM(CASE WHEN line_item_product_code = 'AmazonEC2' 
                THEN line_item_unblended_cost * 0.05
                WHEN line_item_product_code = 'AmazonS3'  
                THEN line_item_unblended_cost * 0.03
                ELSE ine_item_unblended_cost * 0.01
           END) As discounted_cost
       SUM(line_item_usage_amount) AS usage,
       CAST(line_item_usage_start_date AS DATE) AS start_day,
       CAST(line_item_usage_end_date AS DATE) AS end_day
FROM cost_management cm
WHERE line_item_usage_account_id IN ('330') AND
      line_item_usage_start_date BETWEEN DATE '2019-03-01' AND DATE '2019-10-01'
GROUP BY line_item_usage_account_id,
         CAST(line_item_usage_start_date AS DATE),
         CAST(line_item_usage_end_date AS DATE)
HAVING sum(line_item_blended_cost) > 0
ORDER BY line_item_usage_account_id

根据是否满足条件计算列

3 个答案: