>  does it exist a date function  to determine the number of days in a
>  Select, knowing a specifique date ?

January, 2001: 

select '2001-2-1'::datetime - '2001-1-1'::datetime; 

-- 
Kaare Rasmussen            --Linux, spil,--        Tlf:        3816 2582
Kaki Data                tshirts, merchandize      Fax:        3816 2501
Howitzvej 75               Åben 14.00-18.00        Web:      www.suse.dk
2000 Frederiksberg        Lørdag 11.00-17.00       Email: [EMAIL PROTECTED]

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