EC
42P14
PostgreSQLERRORNotableSyntax Error or Access Rule ViolationHIGH confidence

invalid prepared statement definition

What this means

SQLSTATE 42P14 is raised when a PREPARE statement contains a query that cannot be prepared — for example, a multi-statement string or a statement type that does not support parameters.

Why it happens
  1. 1Preparing a statement that contains multiple SQL commands (only one is allowed per PREPARE)
  2. 2Preparing a DDL statement type that does not support parameterisation
How to reproduce

PREPARE with a multi-statement body.

trigger — this will error
trigger — this will error
PREPARE bad_stmt AS SELECT 1; SELECT 2; -- two statements

expected output

ERROR:  cannot insert multiple commands into a prepared statement

Fix

Prepare only a single SQL statement

WHEN When using PREPARE/EXECUTE.

Prepare only a single SQL statement
PREPARE stmt1 AS SELECT 1;
PREPARE stmt2 AS SELECT 2;

Why this works

PREPARE accepts exactly one SQL statement. Split multi-statement strings into individual PREPARE calls.

Sources
Official documentation ↗

Class 42 — Syntax Error or Access Rule Violation (Postgres-specific)

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