Обсуждение: Crosstab Question
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hi All: I'm building an application along the lines of the questionnaire design on varlena.com [1], with slight modifications. In my design, there's a table called chartversionquestion that collects different questions into a bundle to create the questionnaire. Using a view [2] very similar to the one on varlena, I pull all the data from the value tables into one long list (cast to text). I would like to be able to create a crosstab from this view such that the short question name becomes a column header, with the related value underneath. Since the number of questions to be pivoted will vary per questionnaire the method should accept a number of columns parameter. The crosstab in the tablefunc contrib module expects the columns to be explicitly identified before hand. I suppose it could be possible to write a simple function to wrap the crosstab_n_cols functions to be able to return a variable number, but that seems hackish. Are there any other alternatives? David Blewett [1] http://www.varlena.com/GeneralBits/110.php [2] http://www.varlena.com/varlena/GeneralBits/Tidbits/QnA/views.sql -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGul6MZmlc6wNjtLYRCA5hAJ9fSHjNI5gQs/eqZ85bHl4ZrGWG3ACfbEnG zo1KFvZL8LraBESRySyVryg= =w1Z8 -----END PGP SIGNATURE-----
On Aug 8, 2007, at 19:23 , David Blewett wrote: > Since the number of questions to be pivoted will vary per > questionnaire the method should accept a number of columns > parameter. The crosstab in the tablefunc contrib module expects the > columns to be explicitly identified before hand. I suppose it could > be possible to write a simple function to wrap the crosstab_n_cols > functions to be able to return a variable number, but that seems > hackish. Are there any other alternatives? I've done just that in the past. It's pretty straightforward and has worked fine. Michael Glaesemann grzm seespotcode net