# FROM Clause

The `FROM` clause defines which table or table function to query. CRM Analytics SQL supports using `FROM` with a single table only. You can’t select from multiple tables.

CRM Analytics SQL supports the following table functions.

- **[FILL](/docs/analytics/bi-dev-guide-sql/guide/bi-sql-fill.md)**

  Use the `FILL()` table function to fill in any gaps in date fields. By specifying the date fields to check, `FILL()` creates rows that contain the missing month, day, week, quarter, or year and null data. Use it with `TIMESERIES()` to forecast future results when there are gaps in input data.

- **[TIMESERIES](/docs/analytics/bi-dev-guide-sql/guide/bi-sql-timeseries.md)**

  Use the `TIMESERIES()` table function to predict future values based on existing ones tracked over time. Optionally choose a prediction model, confidence interval, and seasonality among other parameters.