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On Mon, Feb 13, 2017 at 11:10 PM, Birgitta Hauser <Hauser@xxxxxxxxxxxxxxx>
wrote:
2. SQL tables never have a key (contrary to DDS described physical files).
For SQL tables AND DDS described tables primary and unique key constraints
can be defined
My only quibble is with the above statement...
SQL tables can and arguably must have a (primary) key; without a key, it's
not a relational table.
I understand you're trying to differentiate between a constraint and the
keyed access path of a DDS physical file.
However, a relational key is a logical component of a relational table.
The implementation details don't really matter. Besides, it's really just
a syntactical difference on the IBM i. Defining a SQL PK constraint on a
SQL tables gives you a *FILE object with a keyed access path just like
you'd get defining a unique key in the DDS for a PF.
Charles
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