On 10/11/10 03:11, Zhang, Jingke wrote:
> Hi all,
Hi,
> I am new here in tracker-list. When I search contact data, I found some
> data with blank "nco:fullname". Then I try to remove them, but failed.
> My tracker is 0.9.16. Can tracker support "remove data by blank value
> condition"? Thanks!
>
> Detail steps:
> ==========
> # tracker-sparql -q "SELECT nco:fullname(?a) nco:nickname(?a) WHERE { ?a
> a nco:PersonContact }"
> Results: 3
> ，
> ，
> ，
> # tracker-sparql -u --query="DELETE { ?a a nco:PersonContact } WHERE {
> ?a nco:fullname '' } "
You should be able to use the "NOT EXISTS" key words there for that,
something like,
DELETE { ?a a nco:PersonContact } WHERE { ?a nco:fullname ?name .
FILTER ( NOT EXISTS {?name} ) }"
(untested)
I was going to link to our documentation on this, but we don't have any,
but here is the official specification:
http://www.w3.org/TR/2010/WD-sparql11-query-20101014/#func-filter-exists
--
Regards,
Martyn
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