You could save the list, and edit it. But, really, there will be no logical relationship between these records. The 1st hundred is just as random as the 2nd or 3rd hundred, unless your modulus is an extremely ill-advised one.
Again, they are hashed records. What we mean by this is that UV will take your item id, extract a numeric equivalent from it (i.e., a238rs45 becomes 23845), then divides by the modulo (a simplification, but reasonably illustrative for our purposes). It takes the resulting remainder (if your modulus was 101, this will be 9), adds 1 (because you can have a remainder of 0), and puts that record into group #10. Unless you know your precise hashing algorithm (which was proprietary, last time I checked), you simply don't know where the record will land. (OK, if you have sequential numeric id's, and you use group.stat.detail to analyze the file, you might be able to predict it, but whatever algorithm you cook up goes out the window if you resize or change the file type, and that's a lot of unnecessary work, anyway). If you want a random sample, use SAMPLE. If you need a logically related group (the last 100 records added, for example), then you should apply selection criteria (SSELECT FILE WITH TIMESTAMP GE xxxx BY-DSND TIMESTAMP). The logic is in the data. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Adrian Halid Sent: Thursday, February 18, 2010 8:06 PM To: U2 Users List Subject: Re: [U2] TOP/LIMIT Equivalent? But how would you get the 2nd 100 (101 - 200) and the 3rd 100 (301 to 400) without writing a subroutine to do it? Regards Adrian Halid Senior Analyst/Programmer IT Vision Australia Pty Ltd (ABN: 34 309 336 904) PO Box 881, Canning Bridge WA 6153 Level 3, Kirin Centre, 15 Ogilvie Road, Applecross, WA, 6153 P: (08) 9315 7000 F: (08) 9315 7088 E: [email protected] W: http://www.itvision.com.au ___________________________________________________________ NOTICE : This e-mail and any attachments are intended for the addressee(s) only and may contain confidential or privileged material. Any unauthorised review, use, alteration, disclosure or distribution of this e-mail (including any attachments) by an unintended recipient is prohibited. If you are not the intended recipient please contact the sender as soon as possible by return e-mail and then delete both messages. ___________________________________________________________ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, 19 February 2010 4:55 AM To: [email protected] Subject: Re: [U2] TOP/LIMIT Equivalent? In a message dated 2/18/2010 10:27:46 AM Pacific Standard Time, [email protected] writes: > You can sort first and then SAMPLE, too.>> Caryl has the idea here if you really want the "Last" 100. You can Sort BY-DSND which means "by descending" so if you want the last alphabetically or the last by ID or the last by some other field you can sort on that and then Sample 100 ? I've NEVER tried this. Does it work? If that doesn't work you can EXECUTE a sort by dsnd and then simply write a brief BASIC routine to pull off the "first" 100 of that list and output it! Will "Where There's a Way there's a Will... or something" Johnson _______________________________________________ U2-Users mailing list [email protected] http://listserver.u2ug.org/mailman/listinfo/u2-users _______________________________________________ U2-Users mailing list [email protected] http://listserver.u2ug.org/mailman/listinfo/u2-users _______________________________________________ U2-Users mailing list [email protected] http://listserver.u2ug.org/mailman/listinfo/u2-users
