How to fix ERROR: syntax error at end of input in PostgreSQL

Review your SQL statement for matching opening and closing parentheses. Count opening ( and closing ) to ensure they're balanced.

Problematic example:

SELECT * FROM users WHERE (age > 21 AND name = 'John'

Fixed version:

SELECT * FROM users WHERE (age > 21 AND name = 'John')

PostgreSQL uses $1, $2, $3 placeholders, not ?. If migrating from MySQL or using generic SQL libraries, update parameter syntax.

Incorrect (MySQL style):

WHERE email = ?

Correct (PostgreSQL):

WHERE email = $1

Ensure all string literals have matching opening and closing quotes (both single ' and double ").

Problematic:

WHERE username = 'admin

Fixed:

WHERE username = 'admin'

Ensure all SQL statements contain complete syntax. For INSERT, include VALUES. For SELECT, include column references and FROM clause.

Incomplete:

INSERT INTO users (name, email)

Complete:

INSERT INTO users (name, email) VALUES ('John', '[email protected]')

If writing PL/pgSQL functions or procedures, ensure correct syntax:

- Do NOT put semicolon immediately after BEGIN
- Use EXECUTE for dynamic queries inside PL/pgSQL

Incorrect:

CREATE FUNCTION test() AS $$
BEGIN;
  SELECT 1;
END;

Correct:

CREATE FUNCTION test() AS $$
BEGIN
  SELECT 1;
END;
$$ LANGUAGE plpgsql;

Isolate the problem by testing a simplified version of your query in psql or a SQL client like pgAdmin. Build complexity gradually.

Start with:

SELECT 1;

Then add table references, filters, and parameters incrementally to identify where the syntax breaks.