I've had a good look around but havnt been able to find a solution so hoping someone can help with this one.
I have a MySQL table of results from an internal logging application which records a result from a check routine, there are a number of check routines which are identified with the tracker column:
id (int)(PK), tracker (int), time (timestamp), result (int)A result only needs to be recorded if the previous result is not the same, only changes need to be captured. Unfortunatly this was ignored when it was built (in a hurry) a month ago and results have been recorded blindly with no checks on previous results. This has now been recorded but I'm still left with a few thousand rows of which a significant number are duplicate entries and I'm after a way of clearing these out to just leave the change points.
So I need to go through each row, look at the previous result recorded by that tracker and delete the row if its the same, this is a bit beyond my experience with MySQL and the attempts I've made so far have been fairly poor!
Can anyone help?