Grok supports visual exploration of relational databases for some of the database providers, including PostgreSQL, MySQL, MS SQL, Maria DB, and Oracle. If a provider supports it, you'll see 'Browse schema' command for the corresponding connection:
Schema browser visualizes all tables with all columns at once, giving you a high-level overview of the database. Click on a table to see its details in the property panel; it is also a good starting point for drill-downs and further exploration. The following quick actions are there:
Grok lets you visually explore both database schema and database content. Simply click on the item (such as connection, table, or column) in the "File | Connect to data" pane to bring up item's properties in the property panel.
In case you want to retrieve only some of the columns, select them (Shift+click) in the schema, and then use context actions that appear in the property panel
See also: