Check Oracle Sequence Exists | Quick SQL Guide
In Oracle database, you can check if a sequence exists using the following SQL statement:
SELECT sequence_name
FROM user_sequences
WHERE sequence_name = 'your_sequence_name';
Simply replace the “your_sequence_name” above with the sequence name you want to query. If the query returns a record, it means the sequence exists; if no record is returned, it means the sequence does not exist.