This has been discussed multiple times, so looking at the searchable archive will give you more detailed info. But as I remember, the consensus suggestion was to index some "impossible" value for those documents that lack a field. For instance, say your field was "sometimes". I document that had nothing to index for that field could get a value of "ZZZZZZZZZZZZZ".
Now your query is simple sometimes:ZZZZZZZZZZZZZ Best Erick On Tue, Sep 2, 2008 at 4:23 AM, Chris Lu <[EMAIL PROTECTED]> wrote: > Is it possible to query for documents that have empty values for a field? > > Say need to find documents with category empty, I tried negative query: > -category:* > But it returns 0 document. I think "category:*" is basically match all, so > this "-category:*" doesn't work. > > Thanks! > > -- > Chris Lu > ------------------------- > Instant Scalable Full-Text Search On Any Database/Application > site: http://www.dbsight.net > demo: http://search.dbsight.com > Lucene Database Search in 3 minutes: > > http://wiki.dbsight.com/index.php?title=Create_Lucene_Database_Search_in_3_minutes > DBSight customer, a shopping comparison site, (anonymous per request) got > 2.6 Million Euro funding! >
