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PostgreSQL error code

PostgreSQL error 0A000

0A000 is the SQLSTATE PostgreSQL reports for feature not supported, in class 0A, Feature Not Supported.

SQLSTATE0A000
Condition namefeature_not_supported
Class0A — Feature Not Supported

Reproduce it, then fix it

PostgreSQL reads a three-part name as database.schema.table, and one connection can only query its own database. Connect to the other database, or reach it through the postgres_fdw or dblink extension. Run the broken query to see the error, then switch to the fixed one. Edit either freely; every run is rolled back.

SELECT count(*) FROM otherdb.public.customers;
SELECT count(*) FROM demo.customers;

Source: PostgreSQL documentation, Appendix A