google-bigquery - 从同一个表中取消嵌套多个字段 - BigQuery

Question

我想为以下查询同时取消 Info2 和 Info3。如何对 BigQuery 中的同一个表执行此操作。 Info3 也有一个类似于 info2 的条件。

谢谢!

ID | startDate | endDate | info1 | info2 | info 3  
----------------------------------------------------
1  | 11-12-2000 | 11-12-2010 | Blue   | Circle   | A
                                      | Triangle | B
                                      | Square   | 
----------------------------------------------------
2  | 11-12-2001 | 11-12-2011 | Yellow |    <*>   | C  
----------------------------------------------------
3  | 11-12-2007 | 11-12-2008 | Brown  |  Circle  | D
                                      | Triangle | B    
----------------------------------------------------

info2!="<*>"AND inf3=B

ID | startDate | endDate | info1 | info2 | info 3  
----------------------------------------------------
1  | 11-12-2000 | 11-12-2010 | Blue   | Circle   | B
1  | 11-12-2000 | 11-12-2010 | Blue   | Triangle | B
1  | 11-12-2000 | 11-12-2010 | Blue   | Square   | B
----------------------------------------------------
3  | 11-12-2007 | 11-12-2008 | Brown  |  Circle  | B
3  | 11-12-2007 | 11-12-2008 | Brown  | Triangle | B
----------------------------------------------------

以下查询将在没有 Info3 的情况下工作。

#standard_SQL    
SELECT
        id,
        startDate,
        endDate,
        info1,
        info2,
        info3
      FROM
         `MY_DB`
      WHERE
        EXISTS (
        SELECT
          Info2
        FROM
          UNNEST(Info2) Temp
        WHERE
          Temp NOT IN ("<*>")) 

Answer 1

下面是 BigQuery 标准 SQL

#standardSQL
WITH `project.dataset.MY_DB` AS (
  SELECT 1 id, '11-12-2000' startDate, '11-12-2010' endDate, 'Blue' info1, ['Circle','Triangle', 'Square'] info2, ['A', 'B'] info3 UNION ALL
  SELECT 2, '11-12-2001', '11-12-2011', 'Yellow', ['<*>'], ['C'] UNION ALL  
  SELECT 3, '11-12-2007', '11-12-2008', 'Brown', ['Circle','Triangle'], ['D', 'B'] 
)
SELECT id, startDate, endDate, info1, info2, info3
FROM `project.dataset.MY_DB`, UNNEST(info2) info2, UNNEST(info3) info3
WHERE info2 != '<*>' AND info3 = 'B'
ORDER BY id

结果如下

Row id  startDate   endDate     info1   info2       info3    
1   1   11-12-2000  11-12-2010  Blue    Circle      B    
2   1   11-12-2000  11-12-2010  Blue    Triangle    B    
3   1   11-12-2000  11-12-2010  Blue    Square      B    
4   3   11-12-2007  11-12-2008  Brown   Circle      B    
5   3   11-12-2007  11-12-2008  Brown   Triangle    B