List columns with indexes in PostgreSQL

Revealing the Secrets: Listing Columns with Indexes in PostgreSQL 🕵️‍♂️

So, you're on a mission to uncover the mysteries of PostgreSQL and find a way to list the columns associated with indexes, huh? 🤔 Don't fret, my tech-savvy friend, for I have just the solution you're looking for! 👀

The Quest for Knowledge 📚

In MySQL, it's as easy as "SHOW INDEXES FOR table" and voila! You have the precious Column_name column to guide you. But alas, PostgreSQL is a different beast altogether. The "\d" command at the "psql" command prompt with the "-E" option might seem promising, but it's not the treasure map you seek. 😢

A Hero Emerges: pg_index ⚔️

Fear not, for I bring tidings of great joy! 🎉 Our hero, "pg_index," will lead us to victory. 💪🏼 This invaluable system catalog table holds the key to unraveling the mystery of columns with indexes in PostgreSQL.

The Solution: Unveiling the Columns 🚀

To reveal the columns associated with indexes in PostgreSQL, we must traverse the lands of the pg_index table. 🌍 Armed with the knowledge bestowed upon us by the wise ones, let's embark on this epic journey.

SELECT
    ci.indrelid::regclass AS table_name,
    a.attname AS column_name
FROM
    pg_index i
JOIN
    pg_class c ON c.oid = i.indexrelid
JOIN
    pg_attribute a ON a.attrelid = c.oid AND a.attnum = ANY (i.indkey)
WHERE
    c.relkind = 'r'
    AND i.indisprimary = FALSE
    AND i.indisunique = FALSE
    AND ci.indisvalid
ORDER BY
    ci.relname,
    a.attnum;

Lo and behold! The SQL query above will grant you the coveted list of columns linked to the indexes in PostgreSQL. 📜 Simply execute this query, and you shall receive the answer you seek. Magic, isn't it? ✨

Bonus Knowledge for the Curious Souls 🔥

In your pursuit of knowledge, you may stumble upon several noteworthy resources to help you on your tech-filled adventures. The Stack Overflow community never fails to illuminate us with valuable insights and guidance. ⭐

• pg_index documentation - Be enlightened by firsthand knowledge from the PostgreSQL documentation itself.

• Extracting META information from PostgreSQL - Delve deeper into the realm of PostgreSQL meta-information and unravel the secrets of its inner workings.

Let's Engage in Tech Talk! 💬

Now that you possess this valuable piece of knowledge, go forth and share it with the world! If you found this guide helpful or have any questions, reach out to us in the comments below. Let's connect and geek out about tech! 🎮🤓

Remember, the journey doesn't end here. The tech realm is vast, and there's always more to explore. Join our community of tech enthusiasts, subscribe to our newsletter, and let's continue this epic adventure together! 💌

Happy indexing, my fellow technologist! Until next time! 👋

Stay curious, stay tech-savvy! 😎