CREATE SEQUENCE orders_seq
START WITH 1000
INCREMENT BY 1;
Creates a sequence with a starting value of 1000 which is incremented by 1.
Using sql Sequences
a reference to seq_name.NEXTVAL is used to get the next value in a sequence. A single statement can only generate a single sequence value. If there are multiple references to NEXTVAL in a statement, they use will use the same generated number.
NEXTVAL can be used for INSERTS
INSERT INTO Orders (Order_UID, Customer)
VALUES (orders_seq.NEXTVAL, 1032);
It can be used for UPDATES
SET Order_UID = orders_seq.NEXTVAL
WHERE Customer = 581;
It can also be used for SELECTS
SELECT Order_seq.NEXTVAL FROM dual;
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