PostgreSQL Syntax

PostgreSQL Error 42601: Syntax Error (Fix Guide)

Fix PostgreSQL Error 42601 syntax error. Covers reserved words, missing keywords, wrong operators, and version-specific syntax.

Mar 12, 2026 5 min read

The Error Message

ERROR: syntax error at or near "keyword"

What Causes PostgreSQL 42601?

PostgreSQL Error 42601 is a syntax error. The SQL parser found something unexpected and cannot continue. The error message tells you exactly where it failed.

Common Causes

Using reserved words unquoted

Words like 'user', 'order', 'group', 'table', 'column' are reserved in PostgreSQL.

Missing keyword

Forgetting AS in a subquery alias, or SET in an UPDATE statement.

Wrong string quotes

PostgreSQL requires single quotes for strings. Double quotes are for identifiers.

MySQL syntax in PostgreSQL

Using backticks, LIMIT offset syntax, or IF() function which are MySQL-specific.

How to Fix It

Step 1: Escape reserved words with double quotes

PostgreSQL uses double quotes (not backticks) for escaping identifiers.

-- Wrong:
SELECT order, user FROM orders;

-- Correct:
SELECT "order", "user" FROM orders;

-- Better: rename columns to avoid conflicts

Step 2: Use correct string quoting

In PostgreSQL, single quotes are for string values and double quotes are for identifiers (table/column names).

-- Wrong (double quotes for strings):
SELECT * FROM users WHERE name = "John";

-- Correct (single quotes):
SELECT * FROM users WHERE name = 'John';

Step 3: Convert MySQL syntax to PostgreSQL

PostgreSQL has different syntax than MySQL for LIMIT/OFFSET, conditional expressions, and string functions.

-- MySQL LIMIT:
SELECT * FROM users LIMIT 10, 20;

-- PostgreSQL equivalent:
SELECT * FROM users LIMIT 20 OFFSET 10;

-- MySQL IF():
SELECT IF(active, 'Yes', 'No') FROM users;

-- PostgreSQL CASE:
SELECT CASE WHEN active THEN 'Yes' ELSE 'No' END FROM users;

Step 4: Add missing aliases

PostgreSQL requires subqueries in the FROM clause to have an alias.

-- Wrong (subquery without alias):
SELECT * FROM (SELECT id FROM users);

-- Correct:
SELECT * FROM (SELECT id FROM users) AS subquery;

How to Prevent This Error

Avoid using reserved words as column names. Use a SQL linter or IDE with PostgreSQL syntax support. When migrating from MySQL, review PostgreSQL's syntax differences.

Fix PostgreSQL Errors with AI2SQL

Instead of debugging SQL syntax manually, describe what you need in plain English and let AI2SQL generate the correct query for PostgreSQL.

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Frequently Asked Questions

What causes PostgreSQL Error 42601?

A syntax error in your SQL query. Common causes include reserved words, wrong quoting, MySQL-specific syntax, or missing keywords like AS for subquery aliases.

How do I escape column names in PostgreSQL?

Use double quotes: SELECT "order" FROM orders. Unlike MySQL which uses backticks, PostgreSQL uses double quotes for identifiers.

Can AI2SQL convert MySQL queries to PostgreSQL?

Yes. AI2SQL supports multiple database dialects. Select PostgreSQL as your target and it generates correct PostgreSQL syntax.