EC
54001
PostgreSQLERRORNotableProgram Limit ExceededHIGH confidence

statement too complex

What this means

SQLSTATE 54001 is raised when a SQL statement is too complex for Postgres to process — typically due to excessive join depth, deeply nested subqueries, or too many relations in a single query that overwhelm the query planner.

Why it happens
  1. 1A query with very deep nesting or many JOINs that exceeds the internal planner complexity limit
How to reproduce

Query with extremely deep nesting or many joins.

expected output

ERROR:  statement too complex

Fix

Break the query into multiple simpler queries using CTEs or temp tables

WHEN When a monolithic query is too complex.

Break the query into multiple simpler queries using CTEs or temp tables
-- Store intermediate results:
CREATE TEMP TABLE step1 AS SELECT ... FROM ... WHERE ...;
SELECT * FROM step1 JOIN ...;

Why this works

Materialising intermediate results in temporary tables allows the planner to tackle each step independently at manageable complexity.

Sources
Official documentation ↗

Class 54 — Program Limit Exceeded

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