On 17/10/12 16:40, George Gallen wrote: > How would I get the contents of the Index? > > George
Don't have the UV BASIC manual in front of me, but it's something like READINDEX variable FROM filedescriptor, indexname[, indexvalue] If you only pass filedescriptor and indexname, it will return a list of all the index values. If you also pass indexvalue, it will return a list of all keys for that value. I'll have a look later and see if I can find that routine - it's probably on my system somewhere, but my archives aren't that organised... Cheers, Wol > > -----Original Message----- > From: u2-users-boun...@listserver.u2ug.org > [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Wols Lists > Sent: Wednesday, October 17, 2012 11:38 AM > To: u2-users@listserver.u2ug.org > Subject: Re: [U2] Selection Suggestions for using UV instead of SQL > > On 17/10/12 14:59, George Gallen wrote: >> Ok. >> >> I have file1 - "people" that has @ID of PID >> I have file2 - "registration" that has @ID of PID+EID+RID (EID = event id, >> RID = registration id) >> >> I want to select people who are not in the registration file with an EID of >> "1". >> >> With an SQL statement - I could join the two, then do the select or use a >> subquery (I'm on UV 10.0.2 - not sure if sub querys work) >> Just curious how this could be done with UV Native, and without involving a >> program. >> >> I first tried "SELECT REGISTRATION WITH EID = '1' SAVING UNIQUE PID" -> >> "NSELECT PEOPLE" >> >> But that returned 0 - since the NSELECT only works off the current select >> list, not the whole file >> >> Yes, I could create a temporary file, then select off that >> Yes, I could read each people record, then loop through registration to see >> if it doesn't exist. >> Both of the above require programming >> I guess I could create a subroutine that does the looping through >> registration, and put that into an I descriptor - looking for another option. >> > Hmmm... > > What I guess I'd do - create an index on file2 based on PID. > > Create an idescriptor on file1 that gets the contents of that index. I > had a routine somewhere that got fed an index value and file, and > returned the contents of the index. It was quite useful, iirc. > > Manipulate it from there. Probably selecting where there is no value > matching ...+1+... > > Cheers, > Wol > _______________________________________________ > U2-Users mailing list > U2-Users@listserver.u2ug.org > http://listserver.u2ug.org/mailman/listinfo/u2-users > _______________________________________________ > U2-Users mailing list > U2-Users@listserver.u2ug.org > http://listserver.u2ug.org/mailman/listinfo/u2-users > _______________________________________________ U2-Users mailing list U2-Users@listserver.u2ug.org http://listserver.u2ug.org/mailman/listinfo/u2-users
