Re: Question(s) about crosstab - Mailing list pgsql-general
On Tue, Dec 17, 2013 at 5:11 PM, David Johnston <polobo@yahoo.com> wrote:
-- 3) Limitation of SQL - explained below:
The function call string that you pass in is just that, a string, the SQL
construct within which it resides has no knowledge of its contents.
SQL has the hard requirement that at the time you submit a query all columns
must be known. If a function is polymorphic (in the sense it can output
different columns/row-types) then when you call that function you must
indicate which columns (and types) are going to be output by the function
during this specific execution.
I guess crosstabs were not all that I hoped they were (basically pivot tables), but thanks for the clear explanation.
Cheers,
Ken
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