Sequence in SQL | SQL Interview Questions And Answers



Purpose of Sequence in SQL

In Oracle, you can create an autonumber field by using sequences. A sequence is an object in Oracle that is used to generate a number sequence. This can be useful when you need to create a unique number to act as a primary key.

The syntax for a sequence is:



CREATE SEQUENCE sequence_name
    MINVALUE value
    MAXVALUE value
    START WITH value
    INCREMENT BY value
    CACHE value;


For example:


CREATE SEQUENCE EMPLOYEE_seq
    MINVALUE 1
    MAXVALUE 999999999999999999999999999
    START WITH 1
    INCREMENT BY 1
    CACHE 20;


While creating a sequence, what does cache and nocache options mean?
With respect to a sequence, the cache option specifies how many sequence values will be stored in memory for faster access.

Relevant Topics in SQL:
  1. Sequence in SQL | SQL Interview Questions And Answers
  2. SQL Interview Questions And Answers - Part 1
  3. SQL Interview Questions And Answers - Part 2
  4. SQL Interview Questions | Complex SQL Queries In Oracle

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Oracle Apps Guy: Sequence in SQL | SQL Interview Questions And Answers
Sequence in SQL | SQL Interview Questions And Answers
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