Using STRING_AGG and ARRAY_CONCAT_AGG
As you recall, the special aggregates fall into three core groups. This exercise will walk through two queries focusing on string and array aggregations. We can explore these two functions using our orders and order_details data.
Latihan ini adalah bagian dari kursus
Introduction to BigQuery
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
-- Fill in the query to find the distinct product categories for each order
SELECT
o.order_id,
-- Use the STRING_AGG to find distinct values and separate them by a comma with a space
___(___ product_category_name_english, ___) AS categories
FROM
ecommerce.ecomm_orders o, UNNEST(order_items) items
JOIN
ecommerce.ecomm_products p ON items.product_id = p.product_id
-- Find the number of items in the order_items column
WHERE ___(o.order_items) > 1
GROUP BY
order_id