In this blog post, you’ll learn more about the Sybase Error An expression of type %1 is not union-compatible with type %2 and the reason for receiving this error
Sybase SQL Error Message
An expression of type %1 is not union-compatible with type %2
Reason for this Error
The two types cannot be combined, for example in a set operation such as UNION or in a SQL function such as COALESCE.