Mastering the PostgreSQL GROUP BY Clause: 7 Powerful Techniques for Efficient Data Analysis

In PostgreSQL, the GROUP BY clause is used to separate rows that have one or more columns in common to their values

Aggregate functions like COUNT(), SUM(), AVG(), MAX(), and MIN() are then implemented on these groups to get the summarized results

The GROUP BY clause is really powerful when you pair it with an aggregate function

NULL values that are not used by the GROUP BY clause are handled differently in PostgreSQL

GROUP BY clause is one of the options that can have query’s performance affected if we use it with large datasets

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