Querying table data is the most common activity performed by the database manager.
The topics that follow describe query techniques. Before continuing, check with the persons responsible for the system in your organization to ensure the sample tables are stored in the system for your use. If they are, you can use them to practice commands and statements as you learn them. Having access to the sample tables is not absolutely necessary, but being able to work with them from your display terminal is of considerable help as you learn to use the system.