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.
This exercise is part of the course
Introduction to BigQuery
Exercise instructions
- Count the number of orders for each
product_idin theecomm_productsdataset.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
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;