[英]Finding part of string and extracting data between delimiter using BigQuery SQL
I have a column like this:我有一个这样的专栏:
String_to_Extract String_to_Extract |
---|
A~S1_B~S2_C~S11 A~S1_B~S2_C~S11 |
A~S1_B~S3_C~S12 A~S1_B~S3_C~S12 |
C~S13_A~S11_B~S4 C~S13_A~S11_B~S4 |
The part before the "~" should be the column name. “~”之前的部分应该是列名。 The part after the "~" should be the row value. “~”后面的部分应该是行值。 This is separated by a "_".这由“_”分隔。 Therefore, the result should look like this:因此,结果应如下所示:
String_to_Extract String_to_Extract | A一个 | B乙 | C C |
---|---|---|---|
A~S1_B~S2_C~S11 A~S1_B~S2_C~S11 | S1 S1 | S2 S2 | S11 S11 |
A~S1_B~S3_C~S12 A~S1_B~S3_C~S12 | S1 S1 | S3 S3 | S12 S12 |
C~S13_A~S11_B~S4 C~S13_A~S11_B~S4 | S11 S11 | S4 S4 | S13 S13 |
Here is my approach:这是我的方法:
SELECT
String_to_Extract,
SUBSTRING(String_to_Extract, INSTR(Advertiser, "A~")+2, ?) AS A,
SUBSTRING(String_to_Extract, INSTR(Advertiser, "B~")+2, ?) AS B,
SUBSTRING(String_to_Extract, INSTR(Advertiser, "C~")+2, ?) AS C,
From Table
How do I get the part between the ~ and next _ for each column?如何获得每列的 ~ 和下一个 _ 之间的部分?
Would be glad about help!很高兴得到帮助!
One approach uses REGEXP_EXTRACT
:一种方法使用REGEXP_EXTRACT
:
SELECT
REGEXP_EXTRACT(String_to_Extract, r"(?:^|_)A~([^_]+)") AS A,
REGEXP_EXTRACT(String_to_Extract, r"(?:^|_)B~([^_]+)") AS B,
REGEXP_EXTRACT(String_to_Extract, r"(?:^|_)C~([^~]+)") AS C
FROM yourTable;
Consider below approach (BigQuery)考虑以下方法(BigQuery)
select * from (
select String_to_Extract, col_val[offset(0)] as col, col_val[offset(1)] as val
from your_table, unnest(split(String_to_Extract, '_')) kv,
unnest([struct(split(kv, '~') as col_val)])
)
pivot (any_value(val) for col in ('A', 'B', 'C'))
If applied to sample data in your question - output is如果应用于您问题中的示例数据 - output 是
You can also use this approach which orders the splitted item first and then picks the values:您也可以使用这种方法,首先订购拆分的项目,然后选择值:
select
split(ordered[safe_offset(0)], '~')[safe_offset(1)] as A,
split(ordered[safe_offset(1)], '~')[safe_offset(1)] as B,
split(ordered[safe_offset(2)], '~')[safe_offset(1)] as C
from (
select
array(select _ from unnest(split(Advertiser, '_') ) as _ order by 1) as ordered
from dataset.table
)
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