PostgreSQL: Show tables in PostgreSQL

💥 PostgreSQL: Show tables in PostgreSQL 💥

So you've made the wise decision to dive into the wonderful world of PostgreSQL, but now you're faced with a common question: "How do I show tables in PostgreSQL?" Fear not, for I am here to guide you through this hurdle!

The Quest for Show Tables 🗺️

In MySQL, you can easily display a list of tables using the trusted show tables command. But what about PostgreSQL? Is there a similar command? The answer is both yes and no. PostgreSQL doesn't have a direct equivalent, but don't worry, we've got you covered.

Unveiling the Hidden Tables 🔍

To show tables in PostgreSQL, we need to tap into the power of SQL queries. 📊 Here are a few queries you can use to access the desired information:

1. Using the Information Schema

SELECT table_name 
FROM information_schema.tables 
WHERE table_schema = 'public' 
      AND table_type = 'BASE TABLE';

This query retrieves the names of all tables in the public schema. You can replace public with any schema you want to explore. Remember, PostgreSQL supports multiple schemas within a single database.

2. Using the pg_catalog Schema

SELECT tablename 
FROM pg_catalog.pg_tables 
WHERE schemaname = 'public';

This query does the same job as the previous one but leverages the pg_catalog schema instead.

3. Using the Meta-command

\dt

This is a special meta-command recognized by the psql tool, the interactive terminal for PostgreSQL. Simply type \dt in the psql console, and it will display a list of tables, along with their schemas and other useful information.

Getting Fancy with a Function 🎩

If you find yourself needing to query for tables frequently, you can go the extra mile and create a handy SQL function. 🪄 This way, you can call the function whenever you need a fresh list of tables. Here's an example:

CREATE OR REPLACE FUNCTION show_tables(schema_name TEXT) 
RETURNS TABLE(table_name TEXT) 
AS $$
BEGIN
   RETURN QUERY EXECUTE
   FORMAT('SELECT tablename FROM pg_catalog.pg_tables WHERE schemaname = %L', schema_name);
END
$$ LANGUAGE plpgsql;

After creating this function, you can use it like this:

SELECT * FROM show_tables('public');

It's Your Turn to Shine ✨

Now that you've learned how to show tables in PostgreSQL, it's time to put your newfound knowledge into action! Experiment with these queries, explore different schemas, and embrace the power of PostgreSQL. 🚀

But wait, there's more! 💪 I challenge you to share your favorite PostgreSQL query for listing tables in the comments below. Let's create a treasure trove of knowledge together! 💬💎

Happy Postgre-ing! 😉