On Fri, 23 Sep 2016 16:35:07 +0000
Quan Yong Zhai <q...@msn.com> wrote:
> Quote <<
> A "row value" is an ordered list of two or more scalar values. In
> other words, a "row value" is a vector.>>
>
> A ?row value? is a tuple, not a vector. When your using a tuple, you
> know how many items in it, and the type of each item of it.
That's correct, and addresses Dominique's point, albeit obliquely:
to use a row-value as a list-argument to IN would be to confuse rows
and columns. A row-value has 1 or more columns, but only one row.
It would be nice to use row-values correctly in IN:
select * from T where (a,b) IN ( (1, 'a'), (2, 'b') )
Is that valid?
--jkl
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