Specify Data Source Settings (Database)
The following pages are available for the Database source type:
Select a Data Connection
The "Choose a data connection" page appears if you select Database on the start page. Select an existing connection from the list.

Choose Queries
The next page allows you to create/edit a query or select a stored procedure. The image below shows a generated query displayed in the SQL string editor.
 
Click Run Query Builder... to launch the Query Builder and choose the tables/columns visually.
Configure Query Parameters
If the SQL query contains query parameters, click Next to configure them.

You can use the following techniques to specify a parameter value:
- Assign a static value - Select a query parameter's type from the Type drop-down list and specify a value based on the selected type. 
- Provide a dynamic parameter value - Set the Type option to Expression and specify the Result Type. Click the Value option's ellipsis button and construct an expression in the invoked Expression Editor. 
Click Finish to create a new data source.