Error 2000 (no_data) indicates a SQL statement ran but returned zero rows, often surfacing in FETCH, SELECT INTO, or cursor operations.
PostgreSQL Error 2000 (no_data) appears when a statement completes without returning rows. Check your SELECT criteria, cursor position, and INTO clauses, then adjust the query or add conditional logic to handle empty results to resolve the issue.
PostgreSQL Error 2000
SQLSTATE 02000, labeled no_data, signals that a SQL command completed successfully but produced zero rows. Client libraries often surface it as an error or warning when an application expects at least one row.
The condition frequently arises in cursor FETCH loops, SELECT INTO statements, and functions that assign query output directly to variables.
Although classified as a successful completion state, many ORMs and drivers escalate it, forcing developers to handle it explicitly.
The database throws the no_data condition after executing a data-retrieval statement whose WHERE clause filters out all rows, or when a cursor has advanced past its last record.
It can also appear in PL/pgSQL when SELECT INTO finds nothing to assign.
If the application logic assumes returned rows, unhandled no_data can break loops, raise unexpected exceptions, or cause null dereferences. Resolving it ensures predictable control flow, accurate reporting, and robust ETL pipelines.
Stringent WHERE filters, out-of-range cursor offsets, and missing JOIN keys are primary causes.
Dynamic queries with user parameters routinely trigger no_data when parameters are empty or invalid.
Validate input parameters, relax overly restrictive filters, and add EXISTS checks before SELECT INTO commands. In cursor loops, guard FETCH calls with FOUND to avoid overruns.
In ETL jobs, use INSERT … SELECT alongside ON CONFLICT to skip empty sets gracefully.
For reporting queries, return a default row with COALESCE or generate_series to ensure downstream charts remain stable.
Add ASSERT FOUND checks in PL/pgSQL, implement defensive coding patterns, and monitor query plans to catch overly selective predicates during development.
SQLSTATE 02001 too_many_rows occurs when SELECT INTO returns more than one row. SQLSTATE 42P01 undefined_table surfaces when a referenced relation is missing.
Both require similar investigative steps: verify query text and schema state.
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No. The SQL command executed but found zero rows. The driver may escalate it to inform you.
Wrap FETCH or SELECT INTO in IF FOUND checks or handle the exception in PL/pgSQL.
No. SQLSTATE 02000 exists in all supported PostgreSQL versions.
Galaxy’s AI copilot highlights queries that may return empty sets and suggests EXISTS guards, reducing run-time surprises.
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