IBM DB2 Sequence Usage Guide

IBM DB2 Sequence Usage Guide | Generated by AI

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IBM DB2 Sequence Usage with NEXT VALUE FOR

In IBM DB2, NEXT VALUE FOR is used to retrieve the next value from a sequence, which generates unique, incrementing numbers. Sequences are useful for generating primary keys or other unique identifiers.

Example: Creating and Using a Sequence

Create the sequence (run this once in your DB2 environment):
```
CREATE SEQUENCE my_sequence
START WITH 1
INCREMENT BY 1
NO CYCLE;
```
- This creates a sequence named my_sequence starting at 1, incrementing by 1 each time.
Use the sequence in an INSERT statement to get the next value:
```
INSERT INTO employees (id, name, department)
VALUES (NEXT VALUE FOR my_sequence, 'Alice Johnson', 'Engineering');
```
- This inserts a new row with id as the next sequence value (e.g., 1 for the first use, 2 for the next, etc.).

Key Notes

You can also use it in SELECT queries: SELECT NEXT VALUE FOR my_sequence FROM SYSIBM.SYSDUMMY1;
Sequences are separate from tables and can be shared across multiple tables if needed.
For more details, refer to the IBM DB2 documentation on sequences. If you need examples for other sequence functions like PREVIOUS VALUE FOR, let me know!

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