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A primary key describes the table's uniqueness constraint and implies no order. As it happens, DB2 for i will build an index corresponding to the primary key simply because that's the fastest way for it to be able to check if there's already an instance of the key in the table. Indexes do have order. Indexes can also be created optimized for ascending or descending order, though most of the time an index can be read as fast backwards as forwards.
You can use DatabaseMetaData.getIndexInfo() against a table and match the resulting list against the primary key meta data to find the (one of the) indexes that match the primary key.
Does that help?
Dan Kimmel
-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of James H. H. Lampert
Sent: Tuesday, March 19, 2013 12:02 PM
To: Java 400 List
Subject: Question for the JDBC experts, Re: getPrimaryKeys
Regarding DatabaseMetaData.getPrimaryKeys()
Does this (or anything else) tell you whether a given key is ascending or descending sequence?
--
JHHL
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