how to select nextval from sequence?

How to select the next value from the sequence?

select xxxx.nextval from dual;

where XXXX is your sequence name. 

NEXTVAL is a function used in oracle to get the next value of the sequence.

No current value exists for the sequence until the Oracle NEXVAL function has been called at least once. 

A sequence is a database object, Which helps in generating a unique value(integer). 

One sequence can serve multiple users to generate a unique value.

Sequences can be used to generate primary key values automatically as well.

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