Sequences in Oracle

 Sequences in Oracle

A sequence is a database object that generates a sequence of unique numbers. Sequences are used to generate primary key values and other unique identifiers. Here is an example:

CREATE SEQUENCE order_seq

START WITH 1

INCREMENT BY 1

NOCACHE

NOCYCLE;

This creates a sequence named "order_seq" that starts with the value 1 and increments by 1 for each new value generated. The "NOCACHE" and "NOCYCLE" options specify that the sequence should not be cached and should not wrap around.