How to Fix the Postgres SQL Error [42601]: syntax error at or near 'int'

This guide provides a detailed explanation of the common Postgres SQL error related to syntax issues with integer types and offers clear solutions to avoid such errors in the future.
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Understanding the Postgres SQL Error [42601]

If you’ve encountered the Postgres SQL Error [42601]: syntax error at or near "int", you’re not alone. This error can be quite frustrating, especially when you’re working on a database-related project. Understanding what caused this error and how to resolve it can save you time and effort, so let's dive right in.

The Problem

The error message usually indicates that there is a syntax issue in your SQL block, particularly related to how you declare variables. In the code provided, we see the following block that is likely causing the error:

[[See Video to Reveal this Text or Code Snippet]]

Error Breakdown

Position: 14: This indicates where the error is occurring in your code.

Integer Declaration: The use of int is key here; it's crucial to understand how to declare variables correctly.

The Solution

To resolve the error, there are a couple of adjustments you can make. Let's break these down:

1. Correcting the Variable Type Declaration

First and foremost, it seems that there is a misuse of the integer type. Integer types (smallint, integer, bigint, and int) can only store whole numbers, so trying to assign a string value to an integer variable will result in an error.

Example of the Problematic Line

[[See Video to Reveal this Text or Code Snippet]]

Fix: Change the value of col_1_input to an integer.

2. Properly Using DO $$ Block and plpgsql

To define and execute your block of code successfully in PostgreSQL, you should wrap your declaration in a DO $$ block and add the LANGUAGE plpgsql directive. This is essential for running procedural code in PostgreSQL.

Example of the Corrected Code

[[See Video to Reveal this Text or Code Snippet]]

Summary

In summary, the error you experienced stems primarily from trying to assign a non-integer value to an integer variable. By ensuring that all assigned values match their declared types and enclosing your SQL logic in a proper DO $$ block with language specification, you can prevent this syntax error in the future.

Key Takeaways

Always check that variable types match their assigned values.

Use the DO $$ block with LANGUAGE plpgsql for executing procedural code.

By implementing these changes, you should be able to eliminate the syntax error and streamline your Postgres SQL coding experience. Happy coding!