25007ERRORTier 2 — Caution✅ HIGH confidence

schema and data statement mixing not supported

Category: Invalid Transaction StateVersions: All Postgres versions

What this means

SQLSTATE 25007 is raised when both DDL (schema-changing) statements and DML (data-modifying) statements are mixed in a transaction in a context that does not support this combination.

Why it happens

1Mixing DDL and DML in a transaction in a distributed or external system that does not support it (rare in standard Postgres)

How to reproduce

DDL/DML mixing in an unsupported context.

trigger — this will ERROR

ERROR: schema and data statement mixing not supported

Fix 1: Separate DDL and DML into different transactions

When this error appears.

fix

Why this works

Execute schema changes first in one transaction, then data modifications in a subsequent transaction.

Sources

📚 Official docs: https://www.postgresql.org/docs/current/errcodes-appendix.html

🔧 Source ref: Class 25 — Invalid Transaction State

Confidence assessment

✅ HIGH confidence

Standard SQLSTATE. Rarely encountered in standard Postgres; more relevant to distributed database wrappers.