-- windows functions are really powerful and are somewhat like a group by - except they don't roll everything up into 1 row when grouping. -- windows functions allow us to look at a partition or a ...

-- a Trigger is a block of code that executes automatically executes when an event takes place in a table. -- for example we have these 2 tables, invoice and payments - when a client makes a payment ...

SQL is the world’s most popular language for managing and manipulating databases. Today, Codecademy launched a free Learn SQL interactive course that will teach you the basics of tables, queries, ...