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The database does include in that /complexity/, the ability to specify the ordering of duplicate key values; e.g. LIFO, FIFO,
FCFO, in DDS. Not all accesses to database data are via query,
so realize that non-SQL & non-query interfaces used to
read-by-key can actually effect a read-order to reflect
whatever was specified as the [build]duplicate-key-order
rule(s).
I didn't notice that the originator specified that DDS was
involved, and responded with SQL on my mind. Besides, if the
files had had that specified, I don't think the question would
have been asked. Right?
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