Joins with aggregations
Joins in BigQuery are often combined with aggregations. For example, imagine you have a very long table like our orders table, which has many entries and can expand over time, and our products table, which has fewer entries.
In this exercise, you must count the number of orders per product.
Latihan ini adalah bagian dari kursus
Introduction to BigQuery
Petunjuk latihan
- Count the number of orders for each
product_idin theecomm_productsdataset.
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
WITH orders AS (SELECT
o.order_id,
item.product_id
FROM ecommerce.ecomm_orders o, unnest(o.order_items) item)
SELECT
p.product_id,
COUNT(o.order_id)
FROM orders o
-- Complete the join to the products table
___ ecommerce.ecomm_products p
-- Join the data using the product_id column
___
GROUP BY p.product_id;