Query current sequence value : Value « Sequences « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Sequences » Value

5. 6. 4. Query current sequence value


SQL>

SQL> create sequence deptno_seq start with 50 increment by 10;



Sequence created.



SQL>

SQL> select deptno_seq.currval

  2  from   dual;

select deptno_seq.currval

       *

ERROR at line 1:

ORA-08002: sequence DEPTNO_SEQ.CURRVAL is not yet defined in this session





SQL>

SQL>

SQL> drop sequence deptno_seq;



Sequence dropped.



SQL>

SQL>

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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