----- Original Message ----- From: Anne Piotet To: [EMAIL PROTECTED] Sent: Thursday, September 25, 2003 1:07 PM Subject: Secting according to values of previous records!
Hi! I'm relatively new to MySQL and encounter the following problem: - I have a table (~300'000 records) containing process data (which I get under a given form from plants); a flag (1¦0) signals the start of a new series of trials , moreover another field indicates the waiting time between trial n and trial n+1; the following records should be excluded from the selection: - the first N (1,2,3,4,5...) of a series - if inside a series the waiting time is superior to a given value t0, the next M records in the series should be excluded Now, I should like to be able to parameter the values of N,t0 and M How should I go with that? Does MySQL support global variable? Thanks Anne
