Erik Jones wrote:
See how postgres handles filling the NULLs for you? What you'd really
want to do with this would be to define some functions for setting and
getting a person's answers to a given question or set of questions so
that you could implement some kind of data integrity with regards to
question ids and indices into the answers arrays such as in the example
above you'd want to prevent an entry at index 7 when there is no entry
in the questions table for question_id=7.
It occurs to me that it shouldn't be terribly difficult to make an
alternate version of crosstab() that returns an array rather than tuples
(back when crosstab() was first written, Postgres didn't support NULL
array elements). Is this worth considering for 8.4?
Joe
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