BigQuery - 在数组列上连接表

Question

Table 1

item	unit sold	item - 2	unit sold
x	1000	y	500

Table 2

bundle items	items in bundle
a	['x,y']
b	['x,y,z']

I need to join Table 1 & 2. If Item and item-2 match with items in bundle.

Desired result

item	unit sold	item - 2	unit sold	bundle items	items in bundle
x	1000	y	500	a	[x,y]
x	1000	y	500	b	[x,y,z]

I tried using unnest with no luck.

Left join (
    select b_sku, array_agg(c_sku) as children 
    from p
    group by p.b_sku
  ) y
ON i.sku = unnest(y.children)

Answer 1

Here is a solution that might work for you:

with table_a as (
  select 'x' as item, 1000 as unit_sold union all
  select 'y' as item, 500 as unit_sold union all
  select 'k' as item, 500 as unit_sold
),
table_b as (
  select 'x' as bundle_item, ['x', 'y'] as items_in_bundle union all
  select 'y' as bundle_item, ['x', 'y', 'z'] as items_in_bundle union all
  select 'k' as bundle_item, ['x', 'y', 'z'] as items_in_bundle
)
select * from table_a a 
left join  table_b b on a.item = b.bundle_item
where a.item in unnest(b.items_in_bundle)

As a result row with 'k' item wouldn't be joined because 'k' item is out of 'items_in_bundle' array.

Answer 2

Consider below query.

I need to join Table 1 & 2. If Item and item-2 match with items in bundle.

WITH table1 AS (
  SELECT 'x' item, 1000 unit_sold, 'y' item_2, 500 unit_2_sold
),
table2 AS (
  SELECT 'a' bundle_items, ['x', 'y'] items_in_bundle UNION ALL
  SELECT 'b', ['x', 'y', 'z'] UNION ALL
  SELECT 'c', ['x', 'u', 'v']
)
SELECT *
  FROM table1 t1 LEFT JOIN table2  t2 
    ON t1.item IN UNNEST(t2.items_in_bundle) 
   AND t1.item_2 IN UNNEST(t2.items_in_bundle);

Query results