At 02:07 PM 5/5/2016, Stephen Markson wrote:
What is the best way to implement a column that can be null, but if
not null, must be unique?
Stephen,
The first and most important question: What is the objective?
If your goal is to have a unique column identifier that ultimately
represents a unique Row ID,
I suggest to look into adding a column type GUID with expression
defined as (CVAL('GUID')).
Data type GUID is a binary global unique identifier to store unique
values, which is represented
as a 36-character hexadecimal string.
Note:
GUID data type is specific to R:BASE eXtreme 9.5 (64) and R:BASE X
Enterprise (Version 10).
Very Best R:egards,
Razzak.
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