Help:Nested Inner Join

Question

Hello Folks,
I have a query which has a nested Inner Join as follows
INNER JOIN(Client
INNER JOIN CUBS SNAPSHOT ON Client . Client = CUBS SNAPSHOT . CLIENT) ON CancelDesc . CancelReason = CUBS SNAPSHOT . CANCELREASONcouldnt figure out wat is the quivalent of this nested inner join in Oracle Server. I am trying to create a report based on this inner join of a query. Can anyone throw some light on this.
Thanks

Answer 1

Hi,
Inner joins don't need to be nested. The results will be the same, no matter in what order the tables are joined.
In Oracle, don't use table names with spaces in them, and don't put spaces before or after the dots that separate table name qualifiers from column names.
I think this is what you want:
INNER JOIN     cubs_snapshot  ON     CancelDesc.CancelReason = cubs_snapshot.cancelreason
INNER JOIN     Client            ON     Client.Client           = cubs_snapshot.clientWhenever you have a question, post a little sample data (CREATE TABLE and INSERT statememts) for all tables invlovled, and the results you want from that data.
If you really did need to nest joins, you could join some tables in a sub-query, then use the result set of that sub-query as if it were a table.
For example:
WITH  cubs_and_client            AS
     SELECT     CancelReason
     ,     ...     -- Whatever other columns are needed in superior query or queries
     FROM          client
     INNER JOIN     cubs_snapshot     ON     Client.Client           = cubs_snapshot.client
SELECT     
INNER JOIN     cubs_and_client     ON     CancelDesc.CancelReason = cubs_and_client.CancelReason
...In this example, the two tables cubs_snapshot and client are joined in a sub-query. The results of that sub-query can be referenced later in the query as if it were a table called cubs_and_client, very much like a view.