Tab SQL Clause is a property of an individual option within a tab group. The SQL Clause controls the display of the tab in the interface by using SQL to determine the whether the current state of the data matches the business rule expressed. We can decide whether a tab should display based on the information of the entity that is in context. If we are looking at a person screen the person entity is in context. If we are looking at the company screen then the company is in context.
The following articles explain how the SQL Tab Clause can used in both the user screens and the administrative screens.
Introduction to the Tab SQL Clause
Use in the Admin Screens