In this blog post, you’ll learn more about the Sybase Error The materialized view cannot be changed to immediate because it does not have a unique index on non-aggregate, non-nullable columns and the reason for receiving this error
Sybase SQL Error Message
The materialized view cannot be changed to immediate because it does not have a unique index on non-aggregate, non-nullable columns
Reason for this Error
You attempted to change the refresh type to immediate for a materialized view which does not have a unique index on non-aggregate non-nullable columns. Create a unique index on the materialized view before changing the refresh type.