混淆尝试在 bigquery 中使用 SQL 将行转换为列

Question

我是 bigquery 的新手，我正在尝试编写一个 sql 查询来实现特定的目标。 下面是一个示例数据

|primary_type| year|
|robery      | 2001|
|robery      | 2001|
|robery      | 2002|
|BATTERY     | 2001|
|BATTERY     | 2001|
|BATTERY     | 2002|

下面的查询能够生成这个

select primary_type,
    year,
   count(*) as number_of_crime 
FROM
`bigquery-public-data`
group by primary_type, year
order by year asc;

|primary_type| year|number_of_crime|
|robery      | 2001| 2             |
|robery      | 2002| 1             |
|BATTERY     | 2001| 2             |
|BATTERY     | 2002| 1             |

但目标是能够创建这个，我不确定如何 go

|year|robery|BATTERY|
|2001|2     |2      |
|2002|1     |1      |

Answer 1

考虑以下

execute immediate format('''
select * from your_table
pivot (count(*) for primary_type in (%s))
''', (select "'" || string_agg(distinct primary_type, "','") || "'" from your_table))              

如果应用于您问题中的样本数据 - output 是