[Concept Entry] Postgresql aggregate-expressions

[codecademy-docs]

Reason/inspiration (optional)

We would like a new entry on the Aggregate Expressions concept under PostgreSQL. The entry should go in a new file under docs/content/postgresql/concepts/aggregate-expressions/aggregate-expressions.md.

The entry should include:

• An introductory paragraph that describes the concept
• A �Syntax� section that includes the syntax for the concept (if applicable)
• An �Example� section that shows the concept in use

Please refer to the concept entry template, content standards, and markdown style guide when working on the PR for this issue.

Entry Type (select all that apply)

New Concept Entrty for Existing Topic

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[Johnnie-kay]

Hello @codecademy-docs, I am interested in working on this issue, please i would love to get assigned to it.

[mamtawardhani]

Hey @Johnnie-kay! You’re assigned 🎉 In addition to the documents linked in the description, please also look at the Contribution Guide. After creating a PR, the maintainer(s) (with the collaborator label) will add comments/suggestions to address any revisions before approval.

Is this your first contribution to Codecademy Docs? If so, we’re curious to know how you found out about contributing to Docs.

[github-actions[bot]]

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