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P
42846
Easy Fix
PostgreSQL · Database Server
PostgreSQL SQLSTATE 42846 (cannot_coerce) indicates cannot coerce during query object resolution and SQL compilation.
Quick Answer
Error code 42846 on your PostgreSQL Database Server means: PostgreSQL SQLSTATE 42846 (cannot_coerce) indicates cannot coerce during query object resolution and SQL compilation.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
RDS-POSTGRESAZURE-PG-FLEXCLOUDSQL-PG1112131415161718
Likely Causes
  1. The current statement triggered cannot_coerce, which PostgreSQL classifies as SQLSTATE 42846.
  2. Application SQL, parameter values, or transaction state are incompatible with PostgreSQL rules for cannot coerce.
  3. Environment differences (schema, permissions, or runtime settings) exposed this 42846 condition in production flow.
How to Fix It
1
Capture full query text, bind values, and transaction context for SQLSTATE 42846.
2
Reproduce cannot_coerce in staging with the same schema version and connection settings.
3
Inspect pg logs and execution plan details to isolate the exact failing clause or object.
4
Apply a targeted fix (query rewrite, schema migration, or transaction-order change) for cannot coerce.
5
Deploy and verify SQLSTATE 42846 no longer appears in error telemetry.
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Related Error Codes
0800008003080060800108004
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