Hi there,
is there any convenient way to find the predecessor of a record given
a particular order of the database?
The following select seems a little bit too expensive.
create table tuples ( i int, j int, m int, k int );
select * from tuples
where i<i0
or ( i=i0 and ( j<j0
or ( j=j0 and ( k<k0
or ( k=k0 and m<m0 )
))
))
order by
i desc, j desc, k desc, m desc
limit 1;
I would like to have something like:
declare c cursor for
select * from tuples
order by i,j,k,m;
fetch select *
where i=i0 and j=j0 and k=k0 and m=m0
in c;
fetch backward 1 in c;
Regards,
Holger Klawitter
--
Holger Klawitter +49 (0)251 484 0637
holger@klawitter.de http://www.klawitter.de/
