You are building a report using complex SQL aggregations to locate the required data.
In what type of class do you put these SQL statements?

While reviewing a layout file named sales_order_view.xml you notice the element
<update handle="customer_account"/>
What is the purpose of this element?

Where do you change the frontName for the admin router?

You got a notification about error that occurred on a production environment. The merchant gave you the error identifier.
How do you find the error message based on the identifier?

You have been asked to display details from the customer's latest order on the customer's account dashboard (customer/account/). You create a new custom template to show the information.
How do you obtain an order repository so you can fetch an order?