ljb <ljb9...@pobox.com> writes:
> What syntax or operator did I (accidentally) invoke by putting parentheses
> around my column list?
> SELECT (a, b, c) FROM mytable...
> It gets me a single result column with comma-separated values in
> parentheses (see 2nd SELECT below). I can't find an explanation in the
> PostgreSQL manual. It doesn't seem to be an array, a subquery, row
> constructor, etc. What sort of thing is it?
Yeah, it's a ROW() constructor. According to the SQL spec you're
allowed to omit the "ROW" keyword. Not one of their better ideas
IMO, especially in a syntax that generally prefers wordiness.
It is documented, very briefly, under 4.2.13 Row Constructors:
The key word ROW is optional when there is more than one
expression in the list.
regards, tom lane
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