# SEQUENCE

Config path: `/<database>/<schema>/sequence/<name>.yaml`

Example:

```yaml
start: 1
interval: 1
```

## Schema

* **start** (int) - starting value for sequence (default: 1)
* **interval** (int) - sequence step (default: 1)
* **is\_ordered** (bool) - enforce ordered mode (true) or non-ordered (false) mode for newly created sequence. If omitted, value of `NOORDER_SEQUENCE_AS_DEFAULT` account parameter is automatically used as default.
* **comment** (str)

## Usage notes

1. **Start** is applied on creation of sequence only. Existing sequences always retain their current value.
2. All sequences must be created explicitly and assigned to `default_sequence` of relevant table columns. It helps to preserve sequence value when table must be re-created to apply changes which cannot be applied via `ALTER TABLE`.
3. It is possible to convert an existing ordered sequence into a non-ordered mode. But it is not possible to do it in reverse.

## Links

* [CREATE SEQUENCE](https://docs.snowflake.com/en/sql-reference/sql/create-sequence.html)
* [ALTER SEQUENCE](https://docs.snowflake.com/en/sql-reference/sql/alter-sequence.html)
* [SHOW SEQUENCES](https://docs.snowflake.com/en/sql-reference/sql/show-sequences.html)
* [DESC SEQUENCE](https://docs.snowflake.com/en/sql-reference/sql/desc-sequence.html)
* [Using Sequences](https://docs.snowflake.com/en/user-guide/querying-sequences.html)
* [Parser & JSON Schema (GitHub)](https://github.com/littleK0i/SnowDDL/blob/master/snowddl/parser/sequence.py)


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