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Posted by Pugi! on 11/02/05 18:41
"J.O. Aho" <user@example.net> schreef in bericht
news:3ss896Fpjj4pU1@individual.net...
> Pugi! wrote:
>> I have problem with sql statement.
>> I have made a address-database, problem is concerning getting information
>> out of it.
>
>> Because for not everyone in my address-db I have all that information I
>> created the table lnk_ent_comm
>> When I query database for a certain entity I get all the types of how to
>> communicate with him/her/it that are available. But I would also like to
>> see
>> the types/means of communication that are missing for which there is no
>> entry in table lnk_ent_comm
>> I tried a left join from table communication on lnk_ent_comm, but that
>> doesn't work.
>
> Join your communication table to the lnk_ent_comm table and search for the
> user id_entity and where lnk_ent_comm.value is NULL.
>
>
> //Aho
How do u do that? Could u give example ? Remember there are no null values
in lnk_ent_comm.
Pugi!
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