Using a Sequence : all_sequences « System Tables Data Dictionary « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial

1.	Introduction
2.	Query Select
3.	Set
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5.	Sequences
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28.	Trigger
29.	SQL PLUS Session Environment
30.	System Tables Data Dictionary
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32.	Object Oriented
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Oracle PL/SQL Tutorial » System Tables Data Dictionary » all_sequences

30. 12. 2. Using a Sequence

A sequence generates a series of numbers.
A sequence contains two pseudo columns named currval and nextval.
Before retrieving the current value you must initialize a sequence by retrieving the next value.
When you select test_seq.nextval the sequence is initialized to 1.


SQL> CREATE SEQUENCE test_seq;



Sequence created.



SQL>

SQL> SELECT test_seq.nextval FROM dual;



   NEXTVAL

----------

         1



SQL>

SQL> drop sequence test_seq

  2  /



Sequence dropped.

30. 12. all_sequences
	30. 12. 1.	Get information on all the sequences you have access to using all_sequences.
	30. 12. 2.	Using a Sequence

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