Connect by prior in Oracle 11g

Question

I am upgrading an application from 9i to 11g and I've been told that the connect by prior sql is broken. While I am waiting for the example and the error message, is 11g pickier about looping than 9i was? Can someone point me to some documentation on 10 or 11 changes to hierarchical queries?
Thanks in advance.
Jim

Answer 1

Hi, Jim,
user509659 wrote:
I am upgrading an application from 9i to 11g and I've been told that the connect by prior sql is broken. What do you mean? Post a link, or at least a more complete description of the problem.
While I am waiting for the example and the error message, is 11g pickier about looping than 9i was? Can someone point me to some documentation on 10 or 11 changes to hierarchical queries?There were a lot of improvements to CONNECT BY in Oracle 10, including CONNECT BY NOCYCLE (for working with loops), the CONNECT_BY_ROOT operator, and pseudo-columns CONNECT_BY_ISCYCLE and CONNECT_BY_ISLEAF. Look them up in the SQL Language manual for your version.
I don't know of any improvements or changes to CONNECT BY in Oracle 11.
Oracle 11.2 has recursive WITH clauses, that can do everything that CONNECT BY does, and more. Some things in 11.2 are simpler and more efficient using CONNECT BY, others are better done using recursive WITH clauses.
Everything that CONNECT BY did in earlier versions, it does in Oracle 11, as well. If you have a CONNECT BY query that works in Oracle 9, it should work in Oracle 11, without any changes, though there might be better ways to get the same results in Oracle 11.
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