FAQ: Advanced Aggregates - Daily Revenue

This community-built FAQ covers the “Daily Revenue” exercise from the lesson “Advanced Aggregates”.

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This exercise can be found in the following Codecademy content:

SQL: Analyzing Business Metrics

FAQs on the exercise Daily Revenue

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So this exercise is trying to get us to join the two tables, right? If we are selecting 2 columns, each from a different table, don’t you have to specify which table each column comes from with table_name.column_name?

Then the exercise refused to accept the columns in the above syntax and accepted this:

select date(ordered_at), round(sum(amount_paid), 2)
from orders
join order_items
on orders.id = order_items.id
group by 1
order by 1;

Did I get mixed up with another language somewhere?

the tables for the columns are being specified
On orders.id = order_items.id

orders.id is the id column from the orders table and
order_items.id is the id column from the order_items table

Hi ,

Why are these two queries giving different results ? I used the first one and the second one is solution given by Codecademy.



Select date(ordered_at) , ROUND ( SUM(amount_paid) , 2) AS ‘DAILY REVENUE’
From order_items
Join orders on order_items.id = orders.id
group by 1
order by 1
Limit 10 ;

select date(ordered_at), ROUND(SUM(amount_paid), 2)
from orders
JOIN order_items on
orders.id = order_items.order_id
group by 1
order by 1
Limit 10 ;