I would like to insert lines into a table that I have in my PostgreSQL db from various tables in my computer

Getting Your Data into PostgreSQL: A Practical Guide

So, you’ve got data sitting in various places – maybe a spreadsheet, a CSV file, or even another database – and you need to get it into your PostgreSQL database. Sounds familiar, right? It’s a task almost every data professional faces sooner or later. The good news is that PostgreSQL offers several ways to tackle this, each with its own set of pros and cons. Let’s walk through the most common methods and figure out which one works best for you.

First off, what do I mean by “local tables”? Well, think of it as any data you can access directly from your computer. This could be a CSV on your desktop, an Excel file in your documents folder, or even a database like MySQL running on your machine. The trick is getting that data neatly and efficiently into your PostgreSQL setup.

The Speedy Gonzales: Using COPY for Flat Files

If you’re dealing with large CSV or text files, the COPY command is your best friend. Seriously, this thing is built for speed. It’s like PostgreSQL’s built-in data vacuum, sucking data in at an impressive rate.

Here’s the basic idea:

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