【Oracle】建立序列

PROMPT SEQ_RPS_ID 表序列
DECLARE
    AN_FLAG NUMBER;
BEGIN
    SELECT COUNT(1) INTO AN_FLAG FROM ALL_SEQUENCES  
        WHERE SEQUENCE_NAME='SEQ_RPS_ID';

    If AN_FLAG = 0 Then
        Execute IMMEDIATE 'CREATE SEQUENCE SEQ_RPS_ID
        INCREMENT BY 1
        START WITH 1
        MAXVALUE 999999999999999999999999999
        MINVALUE 1
        CACHE 20';
    END IF;
END;
/
COMMIT;