secuencia de caída de Oracle si existe
DECLARE
s_exist NUMBER(1);
BEGIN
SELECT CASE WHEN exists(SELECT * FROM ALL_SEQUENCES
WHERE SEQUENCE_NAME = 'seq_name') THEN 1
ELSE 0
END INTO s_exist FROM DUAL;
IF s_exist = 1 THEN
EXECUTE IMMEDIATE 'DROP SEQUENCE seq_name';
END IF;
END;
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