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PostgreSQL - GROUP BY multiple columns

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leila
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In this article, we would like to show you how to use GROUP BY statement with multiple columns in PostgreSQL.

Quick solution:

Practical example

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To show how GROUP BY with multiple columns works, we will use the following table:

PostgreSQL - example data used with GROUP BY multiple columns
PostgreSQL - example data used with GROUP BY multiple columns
 

Note:

At the end of this article you can find database preparation SQL queries.

Example

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In this example, we will display the number of users with the same name and department_id.

Query:

Result:

PostgreSQL - GROUP BY multiple columns result
PostgreSQL - GROUP BY multiple columns result

Result explanation:

As we see, the COUNT(*) column contains the number of users with the same name and department_id. For example, there are three people named Ailisa in the department 3.

Database preparation

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create_tables.sql file:

insert_data.sql file:

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