This SQL statement creates a subscription to all tables in the database. You can add the `WITH META` parameter to include schema changes in the subscription, including creating and deleting supertables; adding, deleting, and modifying columns; and creating, deleting, and modifying the tags of subtables. Consumers can determine the message type from the API. Note that this differs from Kafka.
## Program Model
## Programming Model
To subscribe the data from a created topic, the client program needs to follow the programming model described in this section.
1. Create Consumer
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You can delete topics that are no longer useful. Note that you must unsubscribe all consumers from a topic before deleting it.