# Time Series Functions

In addition to the functions listed below, another time series feature is the `SERIES TIMESTAMP` clause, which specifies a table column as the default timestamp. It can be defined at the time of table creation or alteration. For details, see [CREATE TABLE](https://docs.singlestore.com/db/v9.1/reference/sql-reference/data-definition-language-ddl/create-table.md) or [ALTER TABLE](https://docs.singlestore.com/db/v9.1/reference/sql-reference/data-definition-language-ddl/alter-table.md) topic.

## In this section

* [FIRST](https://docs.singlestore.com/db/v9.1/reference/sql-reference/time-series-functions/first.md)
* [LAST](https://docs.singlestore.com/db/v9.1/reference/sql-reference/time-series-functions/last.md)
* [TIME\_BUCKET](https://docs.singlestore.com/db/v9.1/reference/sql-reference/time-series-functions/time-bucket.md)

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Modified at: November 17, 2022

Source: [/db/v9.1/reference/sql-reference/time-series-functions/](https://docs.singlestore.com/db/v9.1/reference/sql-reference/time-series-functions/)

(An index of the documentation is available at /llms.txt)