Maximum value of mulitple columns

Hi all

Using sql server 2005, Im trying in a query to get the maximum value of multiple columns of a table for each of its records.

What im trying to get is the last date an index was used using the table sys.dm_db_usage_stats using the date fields (last_user_seek, last_user_update...).

I looked around the forum for a solution but those i found dont seem to apply really easily to a query.

Anyone got a suggestion?

Dale:

There have been a number of discussions about a similar issue; give a look to this post:

http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=733186&SiteID=1

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Dale L.,

Try using new operators UNPIVOT and "CROSS APPLY".

Code Snippet

create table dbo.t1 (

pk int not null identity unique,

c1 int,

c2 int,

c3 int

)

go

insert into dbo.t1(c1, c2, c3) values(1, 2, 3)

insert into dbo.t1(c1, c2, c3) values(4, 6, 5)

insert into dbo.t1(c1, c2, c3) values(9, 7, 8)

go

select

a.pk,

b.max_value

from

dbo.t1 as a

cross apply

(

select

max(unpvt.[value]) as max_value

from

(

select

t.pk,

t.c1 as [1],

t.c2 as [2],

t.c3 as [3]

from

dbo.t1 as t

where

t.pk = a.pk

) as pvt

unpivot

([value] for [col] in ([1], [2], [3])) as unpvt

group by

unpvt.pk

) as b

go

drop table dbo.t1

go

AMB