In this blog post, you’ll learn more about the Sybase Error The optimizer was unable to construct a valid access plan and the reason for receiving this error
Sybase SQL Error Message
The optimizer was unable to construct a valid access plan
Reason for this Error
The database server was unable to construct a valid access plan for the given request. This is a SQL Anywhere internal error. If it can be reproduced, it should be reported to SAP. You may be able to work around this problem by modifying the query statement.