Klein Balázs wrote:
Hello everybody,
I have a table that stores responses to questions in different
questionnaires. This table will grow to millions of rows.
[snip]
I can store the fact that it is biodata in the bio field - it is biodata if
the value of that field is not 0 and I can index that field and simply use
that as one of the conditions in queries.
Or should I instead create a view that contains only the biodata and select
from that? But will postgres use the indexes than? Would that be a better
approach?
Create the index on the table and a view should use it.
You might like to read up on partial indexes where you can do something
like:
CREATE INDEX my_index ON itemresponse (testoccasionid,itemorder)
WHERE bio > 0;
So long as your query/view definition has WHERE bio > 0 in it then this
index can be used.
HTH
--
Richard Huxton
Archonet Ltd
