Thanks for the detailed response.  I was really confused for a few minutes
this morning noticing both forms in my code.  :)

On Wed, Mar 7, 2018 at 9:44 AM, Richard Hipp <> wrote:

> On 3/7/18, Mark Wagner <> wrote:
> >
> > e.g. both are accepted
> >
> > CREATE TABLE foo(_id primary key, x, y, unique(x), unique(y));
> > CREATE TABLE foo(_id primary key, x, y, unique(x) unique(y));
> >
> > Just curious if this is some historical artifact or if there's some
> > difference between the two that I'm not aware of.
> This appears to be an historical artifact.
> A quick spot-check shows that both forms are accepted and appear to
> work going back to SQLite version 3.0.0 (2004-06-18).  But this is not
> something that has been part of our test suite, so you should strive
> to use only the first (correct) form.
> I would fix this parser problem, except there are literally over a
> trillion SQLite database files in circulation, and even if only 0.001%
> of those use the incorrect second form, that still means millions of
> database files out there that would break if we "fix" it.  Hence, I
> won't document the second form as valid syntax, but I will add test
> cases to make sure the second form continues to be accepted, to ensure
> future compatibility.
> --
> D. Richard Hipp
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