How to get oracle sequence

There are two ways to get the Oracle sequence value: use the NEXTVAL function to return the next value of the sequence and add it to 1, or use the CURRVAL function to return the current value of the sequence.

How to get Oracle sequence values

There are two ways to get the Oracle sequence value:

1. Use the NEXTVAL function

The NEXTVAL function returns the next value of the sequence and adds the value of the sequence by 1. The syntax is as follows:

 <code>SELECT NEXTVAL(sequence_name)</code>

For example:

 <code>SELECT NEXTVAL('CUSTOMER_SEQ')</code>

2. Use the CURRVAL function

The CURRVAL function returns the current value of the sequence. Unlike the NEXTVAL function, it does not increase the value of the sequence. The syntax is as follows:

 <code>SELECT CURRVAL(sequence_name)</code>

For example:

 <code>SELECT CURRVAL('CUSTOMER_SEQ')</code>

Use Cases

Get the sequence value to generate a unique identifier:

 <code>INSERT INTO CUSTOMERS (CUSTOMER_ID, NAME) VALUES (NEXTVAL('CUSTOMER_SEQ'), 'John Doe');</code>

hint

• Make sure the sequence is created and configured correctly.
• For tables that require unique values, using sequences is an efficient way to generate IDs.
• As needed, you can use sequence properties such as INCREMENT and MINVALUE to customize the behavior of the sequence.

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