-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi,
I have a simple SQL problem: I have two tables (two different log files): tbl1 TimeStamp, Code, OrderType ... 10:22:01, 1111, "N" 10:23:02, 1111, "N" 10:23:19, 1111, "N" 10:24:11, 1222, "N" 10:25:11, 1111, "D" 10:27:33, 1111, "N" ... tbl2 TimeStamp Code Price Size ... 10:21:00, 1111, 300, 10 10:22:20, 1555, 221, 10 10:22:30, 1111, 312, 10 10:23:41, 1111, 353, 10 10:24:56, 1222, 156, 30 ... for each row of tbl1 that satisfy for example the condition OrderType="N" and Code=1111 I would like to extract tbl2.Price. The price that I want to select has a tbl2.TimeStamp that is <= tbl1.TimeStamp i.e. given an event in tbl1 I want the price relative to the previous event recorded in tbl2. The query output that I want looks like: tbl1.TimeStamp, tbl2.TimeStamp, tbl1.Code, tbl2.Price 10:22:01, 10:21:00, 1111, 300 10:23:02, 10:22:30, 1111, 312 10:23:19, 10:22:30, 1111, 312 10:27:33, 10:23:41, 1111, 353 Any suggestion? Paolo - -- ======================================================== Paolo Patelli ======================================================== Actual Position: Graduate fellow at Santa Fe Institute 1399 Hyde Park Rd, Santa Fe, New Mexico 87501 USA ph.: 505 984 8800 ext. 293 email: [EMAIL PROTECTED] ======================================================== PhD student, S. Anna School for Advanced Studies via Carducci 40, 56100 Pisa, Italy email: [EMAIL PROTECTED] ======================================================== -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE86vlHk+lyphfv8fURAiI7AJsFz2cbZXSd69skKYUaJ3UpNlKxyACgwOAS QtE415Io+lXwTQaXlYfixoM= =id5e -----END PGP SIGNATURE----- --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
