## Editing a query

You can edit queries added to a catalog at any time. To edit a query, in the Data tab of the Catalog Browser, right-click the query and select Edit Query from the shortcut menu, then in the Query Editor window, edit the query as required. For example, you can add some extra tables to the query and define join relationship among these tables.

This section details how to edit an existing query as follows:

- Adding and deleting tables in a query
- Joining tables in a query
- Filtering the fields of a query
- Editing the SQL statements of a query
- Creating computed columns in a query
- Adding formula fields to a query