how can I use variable within the FROM statement.

Greeting experts!! ^_^
I am working on a store procedure within the sybase DB.
The code that I wrote below is a store procedure.
I am trying to retrieve a database name from sysdatabase (system table) and retrieve sysusers and sysalternates information from each database within the system.
When I try to run the program. I get a error saying "Error: Incorrect syntax near '@dbname'.
 (State:37000, Native Code: 66)" I was told from buddy that if I want to retrieve informations within all the DB. I have to use perl to do so. If there are way to work this out without perl, it will be a great help.

--Create procedure
create procedure sp_altlist as

--Declaring variable
declare @dbname sysname(30)

--Declaring cursor
declare cur cursor for
select name from master..sysdatabases

--Open cursor
open cur

--Fetch cursor info to variable
fetch cur into @dbname

while (@@sqlstatus = 0) --if complete
   SELECT @dbname,,
   FROM @dbname..sysalternates a, @dbname..sysusers u, master..syslogins l
   WHERE a.altsuid=u.suid and a.suid=l.suid
   --Fetch cursor info to variable
   fetch cur into @dbname

--Close cursor
close cur
deallocate cursor cur

Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

you need to use dynamic sql (of course depends on the version of ASE your are running)

change the loop to the following section of code

DECLARE @sql varchar(254)
while (@@sqlstatus = 0) --if complete
   SELECT @sql  = 'SELECT '''+@dbname+''',, '
   +   ' FROM '+@dbname+'..sysalternates a, '+@dbname+'..sysusers u, master..syslogins l '
   +   ' WHERE a.altsuid=u.suid and a.suid=l.suid'

   exec( @sql )

   --Fetch cursor info to variable
   fetch cur into @dbname
soykawasakiAuthor Commented:
Thank you very much for the quick reply.
I have tested it and it WORKED ^_^
with the best regards
don't forget, you need to close the question .... and assign points :)

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
soykawasakiAuthor Commented:
I am first time user. sorry for the unclosed message.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Sybase Database

From novice to tech pro — start learning today.