Dyna syntax clarifications

[kfk]

Hey, I was going through the papers and slides and I was trying to conceptually understand dyna's syntax. Is the below correct?

side("a") = 2
side("b") = 3

ipothenuse += side(A)*side(A)

• Would this be the sum of the squares of 2 numbers?

part_master("part number", "product family", "product group") = some table data in a database
sales("part number", "sales") = some sales data in a database

sales_by_product = part_master + sales

• Would this be a dyna expression similar to an SQL Inner Join?