Duplicate data being loaded by an ETL pipeline without deduplication. Foreign key reference to a row that does not exist in the parent table. NOT NULL column receiving NULL values from the source. Check constraint violated by unexpected data values

Step 1: Read the full error message — it specifies which constraint was violated.. Step 2: Add deduplication logic (e.g., ON CONFLICT DO NOTHING) for unique constraint violations.. Step 3: Ensure foreign key references are loaded in the correct order (parent before child).. Step 4: Add NOT NULL checks in the transformation layer before inserting.

High severitydata format

Power BI Refresh Error:
23000

What does this error mean?

A database constraint (unique, foreign key, check, or not-null) was violated during an INSERT or UPDATE.

Common causes

1Duplicate data being loaded by an ETL pipeline without deduplication
2Foreign key reference to a row that does not exist in the parent table
3NOT NULL column receiving NULL values from the source
4Check constraint violated by unexpected data values

How to fix it

1Step 1: Read the full error message — it specifies which constraint was violated.
2Step 2: Add deduplication logic (e.g., ON CONFLICT DO NOTHING) for unique constraint violations.
3Step 3: Ensure foreign key references are loaded in the correct order (parent before child).
4Step 4: Add NOT NULL checks in the transformation layer before inserting.

Frequently asked questions

How do I prevent 23000 errors in automated pipelines?

Add retry logic with exponential backoff, validate data quality before loading, and monitor pipeline failures in MetricSign to catch this error early.

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