检查前几行以查看值是否存在

Question

对于每个客户 ID 以及 TS，数据集都有几行。

对于每个客户 ID，我想检查 Status 列以检查它是否曾在该客户 ID 的任何先前行中包含 Cancelled 值。 (按TS排序)

CustomerID	Status	TS
Vimes	CANCELLED	Jan 1
Vimes	ACTIVE	Jan 2
Vimes	CANCELLED	Jan 3
Sybill	ACTIVE	Jan 2
Sybill	ACTIVE	Jan 5
Sybill	ACTIVE	Jan 6

结果集应该是这样的，添加了一个带有标志 Rejoiner 的列，用于检查 Status 列的先前值 -

CustomerID	Status	TS	Rejoiner
Vimes	CANCELLED	Jan 1	No
Vimes	ACTIVE	Jan 2	Yes
Vimes	CANCELLED	Jan 3	Yes
Sybill	ACTIVE	Jan 2	No
Sybill	ACTIVE	Jan 5	No
Sybill	CANCELLED	Jan 6	No

Answer 1

下面使用

select *, 
  if(countif(status = 'CANCELLED') over win > 0, 'Yes', 'No') as Rejoiner
from your_table 
window win as (partition by customerid order by unix_date(date(ts)) range between unbounded preceding and 1 preceding)

如果应用于您问题中的示例数据 - 输出为

检查前几行以查看值是否存在

Checking previous rows to see if value exists

sql

google-bigquery