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! 💬
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Happy indexing, my fellow technologist! Until next time! 👋
Stay curious, stay tech-savvy! 😎