[New entry] PostgreSQL Identifiers

[cigar-galaxy82]

Description

Issue Solved

Closes #4532

Type of Change

• Adding a new entry

Checklist

• [x] All writings are my own.
• [x] My entry follows the Codecademy Docs style guide.
• [x] My changes generate no new warnings.
• [x] I have performed a self-review of my own writing and code.
• [x] I have checked my entry and corrected any misspellings.
• [x] I have made corresponding changes to the documentation if needed.
• [x] I have confirmed my changes are not being pushed from my forked main branch.
• [x] I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• [x] I have linked any issues that are relevant to this PR in the Issues Solved section.

[dakshdeepHERE]

This entry is too long if we see the docs standards for concept entry.

[cigar-galaxy82]

Hi @dakshdeepHERE I get your point, sure I can split the entry in first just identifier, and create a different file for each type of identifier

[github-actions[bot]]

👋 @cigar-galaxy82 You have contributed to Codecademy Docs, and we would like to know more about you and your experience. Please take a minute to fill out this four question survey to help us better understand Docs contributions and how we can improve the experience for you and our learners. Thank you for your help!

🎉 Your contribution(s) can be seen here:

https://www.codecademy.com/resources/docs/postgresql/identifers

Please note it may take a little while for changes to become visible. If you're appearing as anonymous and want to be credited, see here.