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Window Functions in PostgreSQL

Get to know tables
OVER()
6. OVER() - practice
Computations with OVER()
Aggregate functions with OVER()
OVER() and WHERE
Summary

Instruction

Good job. Let's try one more exercise.

Exercise

For each item in the purchase table, select its name (column item), price and the average price of all items.

Stuck? Here's a hint!

Use 

AVG(price) OVER()
in order to get the average price of all items.