When you select currval , nextval remains unchanged; nextval only changes when you select nextval to get the next value. : Value « Sequences « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Sequences » Value

5. 6. 3. When you select currval , nextval remains unchanged; nextval only changes when you select nextval to get the next value.


SQL>

SQL> CREATE SEQUENCE test_seq;



Sequence created.



SQL>

SQL> SELECT test_seq.nextval FROM dual;



   NEXTVAL

----------

         1



SQL>

SQL> SELECT test_seq.nextval, test_seq.currval FROM dual;



   NEXTVAL    CURRVAL

---------- ----------

         2          2



SQL>

SQL> SELECT test_seq.nextval, test_seq.currval FROM dual;



   NEXTVAL    CURRVAL

---------- ----------

         3          3



SQL> SELECT test_seq.nextval, test_seq.currval FROM dual;



   NEXTVAL    CURRVAL

---------- ----------

         4          4



SQL>

SQL> SELECT test_seq.nextval, test_seq.currval FROM dual;



   NEXTVAL    CURRVAL

---------- ----------

         5          5



SQL>

SQL> SELECT test_seq.nextval, test_seq.currval FROM dual;



   NEXTVAL    CURRVAL

---------- ----------

         6          6



SQL>

SQL> SELECT test_seq.nextval, test_seq.currval FROM dual;



   NEXTVAL    CURRVAL

---------- ----------

         7          7



SQL>

SQL> drop sequence test_seq

  2  /



Sequence dropped.

5. 6. Value
	5. 6. 1.	Set start value, mini/max value and cache
	5. 6. 2.	Once initialized, you can get the current value from the sequence using currval.
	5. 6. 3.	When you select currval , nextval remains unchanged; nextval only changes when you select nextval to get the next value.
	5. 6. 4.	Query current sequence value
	5. 6. 5.	Get next value from sequence
	5. 6. 6.	select deptno_seq.currval, deptno_seq.nextval
	5. 6. 7.	Automatically including unique sequence numbers during an INSERT.
	5. 6. 8.	Use dual table to check sequence
	5. 6. 9.	Random value based on sequence
	5. 6. 10.	If id is null, use the value from sequence

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