Athena 查询结果显示空值，尽管在查询中不是空条件

Question

我在 Athena 运行中有以下查询。我想接收所有在 'resource_tags_aws_cloudformation_stack_name' 中包含标签的结果。但是，当我运行查询时，我的结果显示 'resource_tags_aws_cloudformation_stack_name' 为空的行，我不知道我做错了什么。

SELECT 
cm.line_item_usage_account_id,
         pr.line_of_business,
         cm.resource_tags_aws_cloudformation_stack_name, 
        SUM(CASE WHEN cm.line_item_product_code = 'AmazonEC2'
THEN line_item_unblended_cost * 0.97    
ELSE cm.line_item_unblended_cost END) AS discounted_cost, 
CAST(cm.line_item_usage_start_date AS DATE) AS start_day
FROM cost_management cm
JOIN prod_cur_metadata pr ON cm.line_item_usage_account_id = pr.line_item_usage_account_id
WHERE cm.line_item_usage_account_id IN ('1234504482')
AND cm.resource_tags_aws_cloudformation_stack_name IS NOT NULL
        AND cm.line_item_usage_start_date
    BETWEEN date '2020-01-01'
        AND date '2020-01-30'
GROUP BY  cm.line_item_usage_account_id,pr.line_of_business,  cm.resource_tags_aws_cloudformation_stack_name, CAST(cm.line_item_usage_start_date AS DATE), pr.line_of_business
HAVING sum(cm.line_item_blended_cost) > 0
ORDER BY  cm.line_item_usage_account_id

Answer 1

您可以尝试 space 下面的用例

    AND Coalesce(cm.resource_tags_aws_cloudformation_stack_name,' ') !=' '

或者，如果您有多个 space，请尝试。如果实际数据

中需要 spaces，则以下查询不好

    AND Regexp_replace(cm.resource_tags_aws_cloudformation_stack_name,' ') is not null

除此之外，您还可能在数据中包含特殊字符，如 CR 或 LF。虽然是罕见的场景

Answer 2

我修改了查询以排除“ ”，这似乎有效：

SELECT 
cm.line_item_usage_account_id,
         pr.line_of_business,
         cm.resource_tags_aws_cloudformation_stack_name, 
        SUM(CASE WHEN cm.line_item_product_code = 'AmazonEC2'
THEN line_item_unblended_cost * 0.97    
ELSE cm.line_item_unblended_cost END) AS discounted_cost, 
CAST(cm.line_item_usage_start_date AS DATE) AS start_day
FROM cost_management cm
JOIN prod_cur_metadata pr ON cm.line_item_usage_account_id = pr.line_item_usage_account_id
WHERE cm.line_item_usage_account_id IN ('1234504482')
AND NOT cm.resource_tags_aws_cloudformation_stack_name = ' ' 
        AND cm.line_item_usage_start_date
    BETWEEN date '2020-01-01'
        AND date '2020-01-30'
GROUP BY  cm.line_item_usage_account_id,pr.line_of_business,  cm.resource_tags_aws_cloudformation_stack_name, CAST(cm.line_item_usage_start_date AS DATE), pr.line_of_business
HAVING sum(cm.line_item_blended_cost) > 0
ORDER BY  cm.line_item_usage_account_id

Athena 查询结果显示空值，尽管在查询中不是空条件

Athena query results show null values despite is not null condition in query

presto

amazon-athena