如何在Snowflake中将字符串拆分为字符? [英] How can I split a string into character in Snowflake?

问题描述

我需要分割一个字符串，例如"abc".分为单个记录，例如"a"，"b"，"c".

这在Snowflake中应该很容易: SPLIT(str，delimiter)

但是，如果分隔符为null或空字符串，则会得到完整的 str ，而不是我期望的字符.

解决方案

更新:SQL UDF

 创建或替换函数split_string_to_char(字符串)返回数组作为$$split(regexp_replace(a，'.'，'，\\ 0'，2)，'，')$$;选择split_string_to_char('hello'); 

---

我在处理

如果要从中创建表:

 <代码>选择*来自表(split_to_table(regexp_replace('abc'，'.'，'，\\ 0'，2)，'，'))y 

在 https://github.com/fhoffa/AdventOfCodeSQL/blob/main/2020/6.sql

I need to split a string like "abc" into individual records, like "a", "b", "c".

This should be easy in Snowflake: SPLIT(str, delimiter)

But if the delimiter is null, or an empty string I get the full str, and not characters as I expected.

解决方案

Update: SQL UDF

create or replace function split_string_to_char(a string)
returns array
as $$
split(regexp_replace(a, '.', ',\\0', 2), ',')
$$
;
select split_string_to_char('hello');

---

I found this problem while working on Advent of Code 2020.

Instead of just splitting a string a working solution is to add commas between all the characters, and then split that on the commas:

select split(regexp_replace('abc', '.', ',\\0', 2), ',')

If you want to create a table out of it:

select *
from table(split_to_table(regexp_replace('abc', '.', ',\\0', 2), ',')) y

As seen on https://github.com/fhoffa/AdventOfCodeSQL/blob/main/2020/6.sql

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