Проверьте, существует ли таблица Oracle

SELECT * FROM USER_TABLES WHERE TABLE_NAME = 'my_table';
-- Tables from schemes you can access
SELECT * FROM ALL_TABLES WHERE OWNER = 'scheme_name' TABLE_NAME = 'my_table';
-- Tables from schemes you can access
SELECT * FROM DBA_TABLES WHERE OWNER = 'scheme_name' TABLE_NAME = 'my_table';
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