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Window Functions in PostgreSQL

Introduction
ROWS
12. Abbreviations – exercise
RANGE
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Summary

Instruction

Fine. Let's do one more exercise

Exercise

For each single_order, show its placed date, total_price and the average price from the current single_order and three previous orders (in terms of the placed date).

Stuck? Here's a hint!

Use ROWS BETWEEN 3 PRECEDING AND CURRENT ROW.