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difference between 2 dates ?

From: gil guerillot <gil.guerillot_at_ratp.fr>
Date: Wed, 13 Feb 2002 17:28:13 +0100
Message-ID: <a4e444$1seq$1@gotix.reseau.ratp> 





here is one table who records all the changes of object status




exemple



OBJ      status           date


A          ON              01/01/02 8:00:00
B          ON              01/01/02 8:00:00
C          ON              01/01/02 10:00:00
A          OFF            01/01/02 11:00:00
A          ON              01/01/02 12:00:00
B          OFF             01/01/02 12:00:00
D          ON              01/01/02 13:00:00
A          OFF             02/01/02 8:00:00





how can i do by a select query for calculate for each object the total time
between ON and OFF
Received on Wed Feb 13 2002 - 10:28:13 CST












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