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Here is an example of how to create a sequence which you can use for creating sequential numbers, typically for ID’s.

CREATE SEQUENCE person_seq
    INCREMENT BY 1
    START WITH 1
    NOMAXVALUE
    NOCYCLE
    CACHE 10;


This is how you would then use the sequence.

INSERT INTO persons (id, name) VALUES (person_seq.NEXTVAL, 'Dylan')
INSERT INTO persons (id, name) VALUES (person_seq.NEXTVAL, 'Isaac')


If you want to select the next ID you would do it like this.

SELECT person_seq.NEXTVAL FROM Dual


To learn more, Managing Sequences and the Oracle DUAL table.

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3. SQL Insert in One Table Based on Values in Another Table
4. Calling Oracle Stored Procedures and Functions
5. Determining Permissions for a User