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Cursor in PostgreSQL
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Summary: in this tutorial, you will learn about the PL/pgSQL Cursors and how to use them to process a result set, row by row.

A PL/pgSQL cursor allows you to encapsulate a query and process each individual row at a time.

Typically, you use cursors when you want to divide a large result set into parts and process each part individually. If you process it at once, you may have a memory overflow error.

On top of that, you can develop a function that returns a reference to a cursor. This is an effective way to return a large result set from a function. The caller of the function can process the result set based on the cursor reference.

Read More : https://reconshell.com/cursor-in-postgresql/
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