At 1:24 -0600 4/6/02, BD wrote:
> Do you know if there is any performance differences between
>a unique index and primary key (if there are no nulls)?
> Is the index file format the same as the primary key?
I cannot answer that with absolute certainty, but as far as I know the
answers are no, and yes.
>At 05:09 PM 4/5/2002, you wrote:
>>>Here are a few easy philosophical questions for a change:
>>>1) For performance or storage benefits, is there a difference between a
>>>Unique Index and Primary Key?
>>There can be only one primary key. There can be multiple unique indexes.
>>Primary keys cannot contain NULL values. Unique indexes can allow NULL
>>values (and in fact, NULL is the one value that can occur multiple
>>times in a unique index).
>>>2) Is there a reason why I should use Primary Key instead of a Unique Index?
>>>3) Why isn't there a syntax for "create primary index index_name on
>>>table_name (fieldlist)" ? I know a primary key can be added with "Alter
>>>table", but if I'm defining indexes for a table, it would look a lot better
>>>in the script if I was using the same syntax.