[Zope] - How to specify multiple sort columns when grouping with IN

[Jim Fulton]

Brad Clements wrote:
> 
> I'm using a ZSQL method to Select rows from a database.
> 
> Depending on user input, I may need to group by "apt_use, faa_cnty,
> faa_city, apt_name" (in that order).
> 
> I want to use things like first-APT_USE, first-FAA_CNTY, etc.
> 
> My database has individual indexes on all of the above fields, but there
> isn't a single index on all of these fields.
> 
> I've been using <!--#in AirportLookup sort=name-->
> 
> To group, do I need to create a new combined key in the database,

Yes, or you let SQL do the sorting for you, using "sort by".

> or
> can I specify something like sort="apt_use;faa_cnty;faa_city"  etc. (it
> doesn't work) but something like that,

No, sort only uses a single attribute.

> or will the use of the first- tags
> automatically cause grouping?

No.

A variation on the "combined key" idea would be to provide a 
method on the sql result object (using a class specified
via the "Adavanced" view on an SQL method) that computed
a tuple of the four fields and then sort on that.

Jim

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