如何在没有“IN”参数的情况下在 BigQuery 中生成 PIVOT 表

Question

So I have a table that looks like this:

list	value	date
cars	10000	2023-01-28
trucks	20000	2022-12-25
vans	55	2023-01-05
trailers	560	2023-11-11

But I want to pivot it so the list value becomes the column and the values becomes the current value column, like this:

date	cars	trucks	vans	trailers
2023-01-28	10000	NA	NA	NA
2022-12-25	NA	20000	NA	NA
2023-01-05	NA	NA	55	NA
2023-11-11	NA	NA	NA	560

What's the best way to do this? I've tried this:

SELECT * FROM 
(select * from `table`)
pivot(sum(list) for list in list)

But this didn't work. Thoughts?

Answer 1

Try going with the CASE expressions:

SELECT date, 
       MAX(CASE WHEN list = 'cars'   THEN value END) AS cars,
       MAX(CASE WHEN list = 'trucks' THEN value END) AS trucks,
       MAX(CASE WHEN list = 'vans'   THEN value END) AS vans
FROM <your_table>
GROUP BY date

Answer 2

Use below simple approach

select * from your_table 
pivot (any_value(value) for list in ('cars', 'trucks', 'vans', 'trailers'))       

if applied to sample data in your question - output is

you can build that query dynamically (so you will not need to explicitly specify values) and use EXECUTE IMMEDIATE to run it - there are plenty examples of such technique here on SO!