I have a problem to get the lates time from my table. Each ID has 4 start time in different columns, and some columns may be null. Here is a sample:
ID L1 L2 R1 R2
D001 10/10/2012 15:00 10/10/2012 15:15 10/10/2012 15:20 10/10/2012 15:50...
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