PostgresDB 02000: No Data

Query returned no data.
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What is

PostgresDB 02000: No Data

 ?
  1. Check if the query is correct and targeting the right table and database. Run a simple query to confirm the table has data:
  2. SELECT * FROM your_table_name LIMIT 5;
  3. Verify the connection to the database is correctly established:
  4. SELECT 1;
  5. Check if the table you are querying is empty:
  6. SELECT COUNT(*) FROM your_table_name;
  7. Examine PostgreSQL logs for any errors or warnings that might indicate the cause. The location of these logs varies but can often be found in /var/log/postgresql/ or by checking the log_directory setting:
  8. tail -f /var/log/postgresql/postgresql-XX-main.log
  9. Replace XX with your PostgreSQL version.
  10. If you suspect the issue might be with transaction isolation or locks preventing data from being visible, check for any active locks:
  11. SELECT * FROM pg_locks pl
    JOIN pg_class pc ON pl.relation = pc.oid
    JOIN pg_database pd ON pl.database = pd.oid
    WHERE pd.datname = 'your_database_name';
  12. Ensure that your query does not have filters or conditions that are too restrictive or incorrect, potentially leading to zero results. Double-check the WHERE clause conditions.
  13. If working with a replication setup, ensure the data has been replicated to the database you are querying from. Check replication status:
  14. SELECT * FROM pg_stat_replication;
  15. For partitioned tables, ensure that the query covers the correct partitions or that the table has data in the partitions being queried. Check partitions for data:
  16. SELECT inhrelid::regclass AS partition_name, n_live_tup
    FROM pg_inherits
    JOIN pg_stat_user_tables ON inhrelid = relid
    WHERE inhparent = 'your_parent_table'::regclass;
  17. If using a role with row-level security policies, ensure that your role has the appropriate permissions to see the data. Check if RLS is enabled and what policies are in place:
  18. SELECT * FROM pg_policies WHERE tablename = 'your_table_name';
  19. Finally, confirm that the database and table you are querying actually exist to avoid querying non-existent entities:
  20. SELECT * FROM pg_database WHERE datname = 'your_database_name';
    SELECT * FROM pg_tables WHERE tablename = 'your_table_name';
Attached error: 
PostgresDB 02000: No Data
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