Apologies, as usual I didn't read the docs carefully enough.
On Tue, May 17, 2016 at 7:13 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:
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> Shay Rojansky <r...@roji.org> writes:
> > A user of mine just raised a strange issue... While it is possible to
> use a
> > parameter in a LIMIT clause, PostgreSQL does not seem to allow using one
> in
> > a FETCH NEXT clause. In other words, while the following works:
> > SELECT 1 LIMIT $1;
> > The following generates a syntax error:
> > SELECT 1 FETCH NEXT $1 ROWS ONLY;
> > Since LIMIT and FETCH NEXT are supposed to be equivalent this behavior is
> > odd.
>
> Per the SELECT reference page:
>
> SQL:2008 introduced a different syntax to achieve the same result,
> which PostgreSQL also supports. It is:
>
> OFFSET start { ROW | ROWS }
> FETCH { FIRST | NEXT } [ count ] { ROW | ROWS } ONLY
>
> In this syntax, to write anything except a simple integer constant for
> start or count, you must write parentheses around it.
>
> The comments about this in gram.y are informative:
>
> * Allowing full expressions without parentheses causes various parsing
> * problems with the trailing ROW/ROWS key words. SQL only calls for
> * constants, so we allow the rest only with parentheses. If omitted,
> * default to 1.
>
> regards, tom lane
>
