Hey, I've got a tableA, that looks like this:
worker_id (number)
part (text)
a_date (date/time)
time_start (date/time)
time_end (date/time)
bad_qty (number)
qty (number)
bad_percent (number)
total_time (number)
efficiency (number)
Some data:
294 PART A 2009-08-12 07:40:00 14:25:00 1 295 0,34...