Developing Apama Applications > Building Dashboards > Using SQL Data > Attaching visualization objects to SQL data > Substitutions
Substitutions
Substitutions allow you to build open-ended displays in which data attachments depend on values defined at the time the display is run. Generic names, such as $table1 and $table2, are used instead of specific values. Later when the display is running, these generic values are defined by the actual names, such as production_table and system_table. In this way, a single display can be reused to show data from a number of different databases.
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