amazon-redshiftHow do I use Amazon Redshift window functions?

Amazon Redshift window functions provide a way to perform calculations across a set of rows that are related to the current row. This is done by using an OVER clause to define the set of rows used for the calculation.

Example

SELECT
  id,
  avg(value) OVER (PARTITION BY id)
FROM table;

This example will calculate the average value for each id. The PARTITION BY clause defines the set of rows used for the calculation.

Parts of the code:

• SELECT: This clause is used to specify the columns to be returned by the query.
• id: This is the column that will be used to partition the data for the calculation.
• avg(value): This is the function used to calculate the average value.
• OVER: This clause defines the set of rows used for the calculation.
• PARTITION BY id: This clause specifies the column used to partition the data.

Helpful links

• Amazon Redshift Documentation
• Postgres Documentation

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