This function allows you to write custom SQL queries against a data source. It can only be connected to data sources that are SQL databases (SQL Server, MySQL, PostgreSQL, Oracle, etc).
Connect the SQL Query node to the data source node, enter the SQL statement that will be executed against the data source, and press OK.
In the example below, a SQL query has been executed against the PostgreSQL server, to return all results from the Customer Profile table, where income was greater than 50,000.
In this example, a SQL query has been executed against the SQL server, to return 3 columns from 2 tables in the database: product category, product subcategory, and product.