如何查找和提取子字符串 BIGQUERY

Question

A 在 BigQuery table 中有一个字符串列，例如：

name
WW_for_all_feed
EU_param_1_for_all_feed
AU_for_all_full_settings_18+
WW_for_us_param_5_for_us_feed
WW_for_us_param_5_feed
WW_for_all_25+

还有一个变量列表，例如：

param_1_for_all
param_5_for_us
param_5 
full_settings

如果“名称”列中的字符串包含此子字符串之一，则需要将其提取：

name	param
WW_for_all_feed	None
EU_param_1_for_all_feed	param_1_for_all
AU_for_all_full_settings_18+	full_settings
WW_for_us_param_5_for_us_feed	param_5_for_us
WW_for_us_param_5_feed	param_5
WW_for_all_25+	None

我想尝试正则表达式和替换，但不知道查找子字符串的模式

Answer 1

下面使用

select name, param
from your_table
left join params 
on regexp_contains(name, param)

如果适用于您问题中的示例数据

with your_table as (
  select 'WW_for_all_feed' name union all
  select 'EU_param_1_for_all_feed' union all
  select 'AU_for_all_full_settings_18+' union all
  select 'WW_for_us_param_5_for_us_feed' union all
  select 'WW_for_all_25+' 
), params as (
  select 'param_1_for_all' param union all
  select 'param_5_for_us' union all
  select 'full_settings' 
)

输出为

but I have an another issue (updated question) If one of params is substring for another?

然后在下面使用

select name, string_agg(param order by length(param) desc limit 1) param
from your_table
left join params 
on regexp_contains(name, param)
group by name

如果应用于更新的数据样本 - 输出为

如何查找和提取子字符串 BIGQUERY

How to fin and extract substring BIGQUERY

sql

google-bigquery