SQL Calculating Turn-Around-Time with Overlapping Concideration -


i have table (parts) store when item requested , when issued. this, can compute each items turn-around-time ("tat"). i'd have column ("computed") overlapping request-to-issue dates computed.

recid   requested   issued       tat   computed md0001  11/28/2012  12/04/2012   6.00    0.00 md0002  11/28/2012  11/28/2012   0.00    0.00 md0003  11/28/2012  12/04/2012   6.00    0.00 md0004  11/28/2012  11/28/2012   0.00    0.00 md0005  11/28/2012  12/10/2012  12.00    0.00 md0006  11/28/2012  01/21/2013  54.00   54.00 md0007  11/28/2012  11/28/2012   0.00    0.00 md0008  11/28/2012  12/04/2012   6.00    0.00 md0009  01/29/2013  01/30/2013   1.00    1.00 md0010  01/29/2013  01/30/2013   1.00    0.00 md0011  02/05/2013  02/06/2013   1.00    1.00 md0012  02/07/2013  03/04/2013  25.00   25.00 md0013  03/07/2013  03/14/2013   7.00    7.00 md0014  03/07/2013  03/08/2013   1.00    0.00 md0015  03/13/2013  03/25/2013  12.00   11.00 md0016  03/20/2013  03/21/2013   1.00    0.00                        totals  133.00   99.00 <- waiting parts tat summary

in above, manually filled in ("computed") column there example of i'm trying accomplish.

note: notice how md0013 affects computed time md0015 md0013 "computed" first. have been md0015 computed first, md0013 affected accordingly - net result there -1 day.


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