BigQuery:SPLIT() 只返回一个值

问题描述

我有一个页面 URL 列组件，其由 / 分隔.我试图在 BigQuery 中运行 SPLIT() 函数，但它只给出第一个值.我想要特定列中的所有值.

I have a page URL column components of which are delimited by /. I tried to run the SPLIT() function in BigQuery but it only gives the first value. I want all values in specific columns.

我不明白如何使用 .

I don't understand how to use the Regexp_extract() example mentioned in Split string into multiple columns with bigquery.

我需要类似于 REGEX_SPLIT_TO_TABLE(<String>, <DELIMITER>) 的东西，它将单个字符串转换为多列.

I need something similar to REGEX_SPLIT_TO_TABLE(<String>, <DELIMITER>) which converts a single string into multiple columns.

查询:

SELECT PK,
DATE(TIMESTAMP(CONCAT(SUBSTR(date,1,4),'-',SUBSTR(date,5,2),'-',SUBSTR(date,7,2),' 00:00:00'))) as visit_date,
hits_page_pagePath,
split(hits_page_pagePath,'/')
FROM [Intent.All2mon] limit 100

推荐答案

2018标准SQL更新:

#standardSQL
SELECT SPLIT(path, '/')[OFFSET(0)] part1,
       SPLIT(path, '/')[OFFSET(1)] part2,
       SPLIT(path, '/')[OFFSET(2)] part3
FROM (SELECT "/a/b/aaaa?c" path)

现在我知道您希望它们位于不同的列中.

---

Now I understand you want them in different columns.

您提供的查询的替代方法:

An alternative to the query you provided:

SELECT FIRST(SPLIT(path, '/')) part1,
       NTH(2, SPLIT(path, '/')) part2,
       NTH(3, SPLIT(path, '/')) part3
FROM (SELECT "/a/b/aaaa?c" path)

NTH(X, SPLIT(s)) 将提供来自 SPLIT 的第 X 个值.FIRST(s) 与 NTH(1, s)

NTH(X, SPLIT(s)) will provide the Xth value from the SPLIT. FIRST(s) is the same as NTH(1, s)

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