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Window Functions in PostgreSQL

Introduction
LEAD and LAG
4. General syntax
FIRST_VALUE, LAST_VALUE, NTH_VALUE
Summary

Instruction

Okay! Let's introduce the general syntax for analytic functions:

<analytic function> OVER (...)

Looks familiar? That's right. Analytic functions are quite easy, their syntax is identical to aggregate functions. The difference is that aggregate functions calculate a cumulative result for all the rows in the window frame, while the analytic functions refer to single rows within the frame.

Exercise

Click Next exercise to continue.