Select 未购买产品 X 的客户 ID

Question

我有 table 个客户 ID 和购买的产品。随着时间的推移，一个客户 ID 可以购买多个产品。

客户ID、产品ID

在 BigQuery 中，我需要为那些没有购买产品 A 的人找到 CustomerID。

我一直在兜圈子试图做自连接，内连接，但我一无所知。

感谢任何帮助。

Answer 1

select customerID
from your_table
group by customerID
having sum(case when productID = 'A' then 1 else 0 end) = 0

并检查它是否只包含一个名字

sum(case when productID contains 'XYZ' then 1 else 0 end) = 0

Answer 2

如果您有客户 table，您可能需要：

select c.*
from customers c
where not exists (select 1 from t where t.customer_id = c.customer_id and t.proectID = 'A');

这将 return 没有购买的客户以及购买了除产品 A 以外的所有产品的客户。当然，您的数据中客户的定义可能是客户进行了购买，在这种情况下，我喜欢 Juergen 的解决方案。

Answer 3

以下适用于 BigQuery 标准 SQL

#standardSQL
SELECT CustomerID
FROM `project.dataset.yourTable`
GROUP BY CustomerID
HAVING COUNTIF(Product = 'A') = 0

您可以使用下面的虚拟数据测试/玩它

#standardSQL
WITH `project.dataset.yourTable` AS (
  SELECT 1234 CustomerID, 'A' Product UNION ALL
  SELECT 11234, 'A' UNION ALL
  SELECT 4567, 'A' UNION ALL
  SELECT 7896, 'C' UNION ALL
  SELECT 5432, 'B' 
)
SELECT CustomerID
FROM `project.dataset.yourTable`
GROUP BY CustomerID
HAVING COUNTIF(Product = 'A') = 0

how would I adjust this so it could be productID contains "xyz"

#standardSQL
WITH `project.dataset.yourTable` AS (
  SELECT 1234 CustomerID, 'Axyz' Product UNION ALL
  SELECT 11234, 'A' UNION ALL
  SELECT 4567, 'A' UNION ALL
  SELECT 7896, 'Cxyz' UNION ALL
  SELECT 5432, 'B' 
)
SELECT CustomerID
FROM `project.dataset.yourTable`
GROUP BY CustomerID
HAVING COUNTIF(REGEXP_CONTAINS(Product, 'xyz')) = 0

Select 未购买产品 X 的客户 ID

Select Customer ID who hasnt purchased product X

sql

self-join

google-bigquery