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Typically, a query might be formulated as follows:

• Show all cities in Germany with a population greater than 500,000; display the name of each city, its population, and its surface area.

• By formulating a query, you can ask that the system generates a table, which can be displayed in various ways.

• Each row in the table shows information about one instance i.e., city, object, person,etc, that is described on a page of its own:

The name of the instance i.e.- the title of the page that describes it, e.g. "Berlin".

The values of some 'properties of the instance (one property per column; e.g., population, surface area).

• The building blocks of a query are restrictions.

• You can also make the following specifications in a query

1. Determine the properties that are to be displayed in the columns
2. Determine how the table is to be formatted-e.g. how the rows are to be sorted







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