Cursors in PostgreSQL
In this lesson from the PostgreSQL Professional playlist, you will learn what a Cursor is in PostgreSQL and understand in which situations this feature can be useful for processing data row by row within the database.
SQL was designed, in its essence, to work with operations in groups. But there are specific scenarios where we need more control over each processed record. That's precisely where Cursors come in.
In this lesson, you will see:
What is a Cursor?
When to use Cursors in PostgreSQL
When to avoid Cursors
Advantages and limitations
Basic structure of a Cursor
Row-by-row processing with FOR ... IN SELECT
Practical example with orders
Practical example with products with low stock
This lesson is ideal for those who already know the basics of SQL and want to advance in PostgreSQL by better understanding how to build more controlled routines, especially in administrative, operational, and automation scenarios.